Undo SMS sending
In Android, Contacts+ allows you to undo the sending of SMS within a specified timeframe.
To activate this feature, open the app settings >> messaging >> select undo SMS >> select the desired timeframe (5 or 10 seconds).
Once activated, after typing a message and hitting the send button, you’ll notice an undo button next to the new message bubble. Touching it within the selected timeframe will cancel the sending of that message.