Telegram Messenger 2
You can download Android Telegram for free on the Google Play Store, the same features as Telegram Desktop and Mac. In Telegram, you can manage secret chats that contain messages, photos and videos that can be 'wrecked' on their own. Telegram is very interesting, that is, you can also add certain keywords to be able to access messages in Telegram. So, other people won't be able to read the messages you sent or sent to you. Very safe.