session-android/res/layout/country_code_text.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:paddingStart="11dp"
    android:paddingEnd="11dp">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="3dp"
        android:src="@drawable/ic_add_white_original_24dp"
        android:tint="@color/core_grey_60"/>

    <EditText
        android:id="@+id/input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="7dp"
        android:paddingBottom="16dp"
        android:background="@color/transparent"
        android:singleLine="true"
        android:inputType="number"
        android:maxLength="3"
        android:digits="1234567890"
        tools:text="123" />

</LinearLayout>