Once you reply, how to exit? Most times the back arrow isn’t there
When replying to a specific message there isn’t an option to exit that mode. Most times the back arrow is not present.
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When you type a reply to a message, you simply tap the blue up arrow to send the message.
To exit that message, tap the back arrow at the top, left of the screen. To back out of the list of messages, swipe up to return to the Home Screen.
If these instructions are not helpful, then please reply, letting us know which iPhone you have and what its iOS is. Instructions may be slightly different depending on those two things.