Download Line App for your Android device and enjoy text messaging with your friends. Line for Android 2.2, Android 2.3, Android 4.0, Android 4.1, Line for Android 4.2, Android 4.3, Android 4.4 . Download Line App for your Android device and enjoy text messaging with your friends. Line App integrates with the Android OS to give you the best experience and performance. Line syncs with your contacts, detecting which ones already have Line App. Simply select a contact and talk for free.