Show example phone numbers.

// FREEBIE

src/Contacts/PhoneNumberUtil.m

@@ -246,6 +246,7 @@
 
 + (NSString *)examplePhoneNumberForCountryCode:(NSString *)countryCode
 {
+    // Signal users are very likely using mobile devices, so prefer that kind of example.
     NSError *error;
     NBPhoneNumber *nbPhoneNumber =
         [[[self sharedUtil] nbPhoneNumberUtil] getExampleNumberForType:countryCode
@@ -253,6 +254,8 @@
                                                                  error:&error];
     OWSAssert(!error);
     if (!nbPhoneNumber) {
+        // For countries that with similar mobile and land lines, use "line or mobile"
+        // examples.
         nbPhoneNumber =
             [[[self sharedUtil] nbPhoneNumberUtil] getExampleNumberForType:countryCode
                                                                       type:NBEPhoneNumberTypeFIXED_LINE_OR_MOBILE