diff --git a/Signal.xcodeproj/project.pbxproj b/Signal.xcodeproj/project.pbxproj
index a48e2a467..49650e7f1 100644
--- a/Signal.xcodeproj/project.pbxproj
+++ b/Signal.xcodeproj/project.pbxproj
@@ -2364,7 +2364,7 @@
 				GCC_WARN_UNUSED_VALUE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = "";
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				ONLY_ACTIVE_ARCH = YES;
 				OTHER_CFLAGS = "-fobjc-arc-exceptions";
 				SDKROOT = iphoneos;
@@ -2424,7 +2424,7 @@
 				GCC_WARN_UNUSED_VALUE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = "";
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				ONLY_ACTIVE_ARCH = NO;
 				OTHER_CFLAGS = (
 					"-DNS_BLOCK_ASSERTIONS=1",
diff --git a/Signal/src/ViewControllers/MessageComposeTableViewController.m b/Signal/src/ViewControllers/MessageComposeTableViewController.m
index 374fe6153..074c35732 100644
--- a/Signal/src/ViewControllers/MessageComposeTableViewController.m
+++ b/Signal/src/ViewControllers/MessageComposeTableViewController.m
@@ -15,6 +15,7 @@
 #import "UIUtil.h"
 #import "UIView+OWS.h"
 #import <MessageUI/MessageUI.h>
+#import <SignalServiceKit/AppVersion.h>
 #import <SignalServiceKit/PhoneNumberUtil.h>
 #import <SignalServiceKit/SignalAccount.h>
 #import <SignalServiceKit/TSAccountManager.h>
@@ -229,6 +230,41 @@ NS_ASSUME_NONNULL_BEGIN
     [self showContactAppropriateViews];
 }
 
+- (void)viewDidAppear:(BOOL)animated {
+    [super viewDidAppear:animated];
+    
+    [self showIOSUpgradeNagIfNecessary];
+}
+
+- (void)showIOSUpgradeNagIfNecessary {
+    // Only show the nag to iOS 8 users.
+    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(9, 0)) {
+        return;
+    }
+
+    // Don't show the nag to users who have just launched
+    // the app for the first time.
+    if (![AppVersion instance].lastAppVersion) {
+        return;
+    }
+
+    // Only show the nag once per update of the app.
+    NSString *currentAppVersion = [AppVersion instance].currentAppVersion;
+    OWSAssert(currentAppVersion.length > 0);
+    NSString *lastNagAppVersion = [Environment.preferences iOSUpgradeNagVersion];
+    if (lastNagAppVersion &&
+        ![lastNagAppVersion isEqualToString:currentAppVersion]) {
+        
+        [Environment.preferences setIOSUpgradeNagVersion:currentAppVersion];
+        
+        [OWSAlerts showAlertWithTitle:
+         NSLocalizedString(@"UPGRADE_IOS_ALERT_TITLE",
+                           @"Title for the alert indicating that user should upgrade iOS.")
+                              message:NSLocalizedString(@"UPGRADE_IOS_ALERT_MESSAGE",
+                                                        @"Message for the alert indicating that user should upgrade iOS.")];
+    }
+}
+
 #pragma mark - Table Contents
 
 - (void)updateTableContents
diff --git a/Signal/src/environment/PropertyListPreferences.h b/Signal/src/environment/PropertyListPreferences.h
index d43d84977..de8a7819a 100644
--- a/Signal/src/environment/PropertyListPreferences.h
+++ b/Signal/src/environment/PropertyListPreferences.h
@@ -58,6 +58,9 @@ extern NSString *const PropertyListPreferencesKeyEnableDebugLog;
 - (BOOL)hasDeclinedNoContactsView;
 - (void)setHasDeclinedNoContactsView:(BOOL)value;
 
+- (void)setIOSUpgradeNagVersion:(NSString *)value;
+- (nullable NSString *)iOSUpgradeNagVersion;
+
 #pragma mark - Calling
 
 #pragma mark Callkit
diff --git a/Signal/src/environment/PropertyListPreferences.m b/Signal/src/environment/PropertyListPreferences.m
index 7f65b46ec..f7c805aab 100644
--- a/Signal/src/environment/PropertyListPreferences.m
+++ b/Signal/src/environment/PropertyListPreferences.m
@@ -26,6 +26,7 @@ NSString *const PropertyListPreferencesKeyCallKitEnabled = @"CallKitEnabled";
 NSString *const PropertyListPreferencesKeyCallKitPrivacyEnabled = @"CallKitPrivacyEnabled";
 NSString *const PropertyListPreferencesKeyCallsHideIPAddress = @"CallsHideIPAddress";
 NSString *const PropertyListPreferencesKeyHasDeclinedNoContactsView = @"hasDeclinedNoContactsView";
+NSString *const PropertyListPreferencesKeyIOSUpgradeNagVersion = @"iOSUpgradeNagVersion";
 
 @implementation PropertyListPreferences
 
@@ -191,6 +192,16 @@ NSString *const PropertyListPreferencesKeyHasDeclinedNoContactsView = @"hasDecli
     [self setValueForKey:PropertyListPreferencesKeyHasDeclinedNoContactsView toValue:@(value)];
 }
 
+- (void)setIOSUpgradeNagVersion:(NSString *)value
+{
+    [self setValueForKey:PropertyListPreferencesKeyIOSUpgradeNagVersion toValue:value];
+}
+
+- (nullable NSString *)iOSUpgradeNagVersion
+{
+    return [self tryGetValueForKey:PropertyListPreferencesKeyIOSUpgradeNagVersion];
+}
+
 #pragma mark - Calling
 
 #pragma mark CallKit
diff --git a/Signal/translations/ar.lproj/Localizable.strings b/Signal/translations/ar.lproj/Localizable.strings
index 089c84283..bea84d5c9 100644
--- a/Signal/translations/ar.lproj/Localizable.strings
+++ b/Signal/translations/ar.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "أهلاً بالاتصالات الفيديوية الآمنة! ";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "ترقية Signal ...";
 
diff --git a/Signal/translations/az_AZ.lproj/Localizable.strings b/Signal/translations/az_AZ.lproj/Localizable.strings
index 72ead4cf8..4cf63cb4b 100644
--- a/Signal/translations/az_AZ.lproj/Localizable.strings
+++ b/Signal/translations/az_AZ.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Signal yenilənir...";
 
diff --git a/Signal/translations/bg.lproj/Localizable.strings b/Signal/translations/bg.lproj/Localizable.strings
index d6fdf27d3..af50f9f58 100644
--- a/Signal/translations/bg.lproj/Localizable.strings
+++ b/Signal/translations/bg.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Здравейте Безопасни Видео Обаждания!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Обновяване на Сигнал ...";
 
diff --git a/Signal/translations/bs.lproj/Localizable.strings b/Signal/translations/bs.lproj/Localizable.strings
index b7207829f..817667269 100644
--- a/Signal/translations/bs.lproj/Localizable.strings
+++ b/Signal/translations/bs.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Signal se nadograđuje ...";
 
diff --git a/Signal/translations/ca.lproj/Localizable.strings b/Signal/translations/ca.lproj/Localizable.strings
index 29d297e0f..6dc6b3196 100644
--- a/Signal/translations/ca.lproj/Localizable.strings
+++ b/Signal/translations/ca.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Telefonades de Vídeo Segures!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "S'està actualitzant el Signal...";
 
diff --git a/Signal/translations/cs.lproj/Localizable.strings b/Signal/translations/cs.lproj/Localizable.strings
index 9bd3f78d3..66269096c 100644
--- a/Signal/translations/cs.lproj/Localizable.strings
+++ b/Signal/translations/cs.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Aktualizace Signalu...";
 
diff --git a/Signal/translations/da.lproj/Localizable.strings b/Signal/translations/da.lproj/Localizable.strings
index 525b0cc98..a6058b71b 100644
--- a/Signal/translations/da.lproj/Localizable.strings
+++ b/Signal/translations/da.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Opdatere Signal ...";
 
diff --git a/Signal/translations/de.lproj/Localizable.strings b/Signal/translations/de.lproj/Localizable.strings
index ee86943db..3fb0e15bc 100644
--- a/Signal/translations/de.lproj/Localizable.strings
+++ b/Signal/translations/de.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hallo, sichere Videoanrufe!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Signal wird aktualisiert …";
 
diff --git a/Signal/translations/el_GR.lproj/Localizable.strings b/Signal/translations/el_GR.lproj/Localizable.strings
index d7175bf48..8193ec771 100644
--- a/Signal/translations/el_GR.lproj/Localizable.strings
+++ b/Signal/translations/el_GR.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/en.lproj/Localizable.strings b/Signal/translations/en.lproj/Localizable.strings
index b5887d7e9..5cde7f3c1 100644
--- a/Signal/translations/en.lproj/Localizable.strings
+++ b/Signal/translations/en.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/es.lproj/Localizable.strings b/Signal/translations/es.lproj/Localizable.strings
index 23957c6e7..d862c3ce4 100644
--- a/Signal/translations/es.lproj/Localizable.strings
+++ b/Signal/translations/es.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "¡Hola vídeollamadas seguras!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Actualizando Signal...";
 
diff --git a/Signal/translations/fa.lproj/Localizable.strings b/Signal/translations/fa.lproj/Localizable.strings
index a15037f9c..dbb80d93d 100644
--- a/Signal/translations/fa.lproj/Localizable.strings
+++ b/Signal/translations/fa.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/fi.lproj/Localizable.strings b/Signal/translations/fi.lproj/Localizable.strings
index 3f13cea14..86a566cff 100644
--- a/Signal/translations/fi.lproj/Localizable.strings
+++ b/Signal/translations/fi.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hei, turvalliset videopuhelut!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Päivitetään Signalia ...";
 
diff --git a/Signal/translations/fil.lproj/Localizable.strings b/Signal/translations/fil.lproj/Localizable.strings
index 41f38f0e8..ebd83daa8 100644
--- a/Signal/translations/fil.lproj/Localizable.strings
+++ b/Signal/translations/fil.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/fr.lproj/Localizable.strings b/Signal/translations/fr.lproj/Localizable.strings
index b5f9098a0..1da3619ec 100644
--- a/Signal/translations/fr.lproj/Localizable.strings
+++ b/Signal/translations/fr.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Bonjour Appels vidéo sécurisés!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Mise à niveau de Signal ...";
 
diff --git a/Signal/translations/gl.lproj/Localizable.strings b/Signal/translations/gl.lproj/Localizable.strings
index 657a9857c..00046addc 100644
--- a/Signal/translations/gl.lproj/Localizable.strings
+++ b/Signal/translations/gl.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Ola videochamadas seguras!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Actualizando Signal...";
 
diff --git a/Signal/translations/he.lproj/Localizable.strings b/Signal/translations/he.lproj/Localizable.strings
index f7c0694dd..c1f0f3016 100644
--- a/Signal/translations/he.lproj/Localizable.strings
+++ b/Signal/translations/he.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/hr.lproj/Localizable.strings b/Signal/translations/hr.lproj/Localizable.strings
index 574666c4a..252840d82 100644
--- a/Signal/translations/hr.lproj/Localizable.strings
+++ b/Signal/translations/hr.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Pozdrav sigurnim video pozivima!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Signal se nadograđuje...";
 
diff --git a/Signal/translations/hu.lproj/Localizable.strings b/Signal/translations/hu.lproj/Localizable.strings
index 9bc499a49..a60e952ca 100644
--- a/Signal/translations/hu.lproj/Localizable.strings
+++ b/Signal/translations/hu.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/id.lproj/Localizable.strings b/Signal/translations/id.lproj/Localizable.strings
index c0d1795d2..8dc63bff5 100644
--- a/Signal/translations/id.lproj/Localizable.strings
+++ b/Signal/translations/id.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Memperbaharui Signal ...";
 
diff --git a/Signal/translations/it_IT.lproj/Localizable.strings b/Signal/translations/it_IT.lproj/Localizable.strings
index a667ef791..2a530075b 100644
--- a/Signal/translations/it_IT.lproj/Localizable.strings
+++ b/Signal/translations/it_IT.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Chiamate Video Sicure!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Aggiornamento Signal...";
 
diff --git a/Signal/translations/ja_JP.lproj/Localizable.strings b/Signal/translations/ja_JP.lproj/Localizable.strings
index 69f5bdc3d..be0442bc7 100644
--- a/Signal/translations/ja_JP.lproj/Localizable.strings
+++ b/Signal/translations/ja_JP.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "安全なビデオ電話にようこそ！";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Signalをアップグレードしています……";
 
diff --git a/Signal/translations/km.lproj/Localizable.strings b/Signal/translations/km.lproj/Localizable.strings
index 9e2d6320a..6e1cdf08c 100644
--- a/Signal/translations/km.lproj/Localizable.strings
+++ b/Signal/translations/km.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "សួស្តី ការហៅវីដេអូសុវត្ថិភាព!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "កំពុងធ្វើបច្ចុប្បន្នភាព Signal ...";
 
diff --git a/Signal/translations/ko_KR.lproj/Localizable.strings b/Signal/translations/ko_KR.lproj/Localizable.strings
index 456a4d25e..af7b245df 100644
--- a/Signal/translations/ko_KR.lproj/Localizable.strings
+++ b/Signal/translations/ko_KR.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/lt.lproj/Localizable.strings b/Signal/translations/lt.lproj/Localizable.strings
index 59bf5ea55..b2e97de44 100644
--- a/Signal/translations/lt.lproj/Localizable.strings
+++ b/Signal/translations/lt.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Sveiki, saugūs vaizdo skambučiai!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Naujinama Signal ...";
 
diff --git a/Signal/translations/lv.lproj/Localizable.strings b/Signal/translations/lv.lproj/Localizable.strings
index 099c8ee03..b1a235e75 100644
--- a/Signal/translations/lv.lproj/Localizable.strings
+++ b/Signal/translations/lv.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/mk.lproj/Localizable.strings b/Signal/translations/mk.lproj/Localizable.strings
index 4720b0c99..aa1ed0afe 100644
--- a/Signal/translations/mk.lproj/Localizable.strings
+++ b/Signal/translations/mk.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Здраво Сигурносни Видео Повици!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Ажурирање на Сигнал ...";
 
diff --git a/Signal/translations/nb_NO.lproj/Localizable.strings b/Signal/translations/nb_NO.lproj/Localizable.strings
index e1f4be097..c616b2c1a 100644
--- a/Signal/translations/nb_NO.lproj/Localizable.strings
+++ b/Signal/translations/nb_NO.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Velkommen til sikre videosamtaler!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Oppgraderer Signal ...";
 
diff --git a/Signal/translations/nl.lproj/Localizable.strings b/Signal/translations/nl.lproj/Localizable.strings
index 197c4a0a8..a8b23299e 100644
--- a/Signal/translations/nl.lproj/Localizable.strings
+++ b/Signal/translations/nl.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hallo, beveiligde videogesprekken!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Signal wordt bijgewerkt...";
 
diff --git a/Signal/translations/pl.lproj/Localizable.strings b/Signal/translations/pl.lproj/Localizable.strings
index 99af24f7c..ceaf52cc6 100644
--- a/Signal/translations/pl.lproj/Localizable.strings
+++ b/Signal/translations/pl.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Szyfrowane wideo rozmowy witają!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Aktualizuję Signal ...";
 
diff --git a/Signal/translations/pt_BR.lproj/Localizable.strings b/Signal/translations/pt_BR.lproj/Localizable.strings
index 916c99949..ff00777b5 100644
--- a/Signal/translations/pt_BR.lproj/Localizable.strings
+++ b/Signal/translations/pt_BR.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Olá, chamadas seguras em vídeo!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Atualizando Signal ...";
 
diff --git a/Signal/translations/pt_PT.lproj/Localizable.strings b/Signal/translations/pt_PT.lproj/Localizable.strings
index 6ab7acff1..2cbb6b7e9 100644
--- a/Signal/translations/pt_PT.lproj/Localizable.strings
+++ b/Signal/translations/pt_PT.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Olá Videochamadas seguras!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "A actualizar o Signal...";
 
diff --git a/Signal/translations/ro.lproj/Localizable.strings b/Signal/translations/ro.lproj/Localizable.strings
index f09b30b93..09293e01f 100644
--- a/Signal/translations/ro.lproj/Localizable.strings
+++ b/Signal/translations/ro.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Bun venit la apeluri video securizate!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Se actualizează Signal ...";
 
diff --git a/Signal/translations/ru.lproj/Localizable.strings b/Signal/translations/ru.lproj/Localizable.strings
index 2eccb6f5a..91465ec71 100644
--- a/Signal/translations/ru.lproj/Localizable.strings
+++ b/Signal/translations/ru.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Добро пожаловать в Видео Звонки!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Обновление...";
 
diff --git a/Signal/translations/sl.lproj/Localizable.strings b/Signal/translations/sl.lproj/Localizable.strings
index 8d59946db..53599f4e9 100644
--- a/Signal/translations/sl.lproj/Localizable.strings
+++ b/Signal/translations/sl.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "NOVO: varni video klici!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Posodabljam Signal...";
 
diff --git a/Signal/translations/sn.lproj/Localizable.strings b/Signal/translations/sn.lproj/Localizable.strings
index 7fb725161..549d0324c 100644
--- a/Signal/translations/sn.lproj/Localizable.strings
+++ b/Signal/translations/sn.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Upgrading Signal ...";
 
diff --git a/Signal/translations/sq.lproj/Localizable.strings b/Signal/translations/sq.lproj/Localizable.strings
index 597a37094..525567e7c 100644
--- a/Signal/translations/sq.lproj/Localizable.strings
+++ b/Signal/translations/sq.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Shkarkim i funksionaliteteve të reja...";
 
diff --git a/Signal/translations/sv_SE.lproj/Localizable.strings b/Signal/translations/sv_SE.lproj/Localizable.strings
index 751d3644e..b2728cd56 100644
--- a/Signal/translations/sv_SE.lproj/Localizable.strings
+++ b/Signal/translations/sv_SE.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hallå säkra videosamtal!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Uppgraderar Signal ...";
 
diff --git a/Signal/translations/th_TH.lproj/Localizable.strings b/Signal/translations/th_TH.lproj/Localizable.strings
index 14e3cf3c9..e096f0b42 100644
--- a/Signal/translations/th_TH.lproj/Localizable.strings
+++ b/Signal/translations/th_TH.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Hello Secure Video Calls!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "กำลังอัปเกรด Signal ...";
 
diff --git a/Signal/translations/tr_TR.lproj/Localizable.strings b/Signal/translations/tr_TR.lproj/Localizable.strings
index d18fb2801..822a3f9e4 100644
--- a/Signal/translations/tr_TR.lproj/Localizable.strings
+++ b/Signal/translations/tr_TR.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "Merhaba güvenli görüntülü aramalar!";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "Signalı yükselt ...";
 
diff --git a/Signal/translations/zh_CN.lproj/Localizable.strings b/Signal/translations/zh_CN.lproj/Localizable.strings
index 93ee620ec..2fb032289 100644
--- a/Signal/translations/zh_CN.lproj/Localizable.strings
+++ b/Signal/translations/zh_CN.lproj/Localizable.strings
@@ -1282,6 +1282,12 @@
 /* Header for upgrade experience */
 "UPGRADE_EXPERIENCE_VIDEO_TITLE" = "现推出安全的视频通话！";
 
+/* Message for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_MESSAGE" = "Signal will soon require iOS 9 or later. Please upgrade in Settings app >> General >> Software Update.";
+
+/* Title for the alert indicating that user should upgrade iOS. */
+"UPGRADE_IOS_ALERT_TITLE" = "Upgrade iOS";
+
 /* No comment provided by engineer. */
 "Upgrading Signal ..." = "升级Signal…";