Everything happens in the background and you don't need to worry about it till you actually need to undo/redo what you wrote. In that case, tap the floating icon and Inputting+ shows up as a pop-up window. Undo and Redo: Tap the Undo or Redo arrows to find the text you had recently typed.
To undo a message that you sent, simply swipe down from the top-right corner of the iPhone's screen to bring up Control Center and quickly enable Airplane Mode on most iPhones or iPads.
Open Settings ➔ Accessibility ➔ Touch ➔ Shake to Undo - You can turn that ON. Note that it is NOT going to undo the action for any text that is deleted in the text box. It is a general Undo command that works where applicable. Axel F.
Apple iPhone - Delete Messages
Here is how to access it.
Immediately recall any messages you accidentally sent In either case, you'll be able to recall those messages when iOS 16 becomes available. With the new feature, you'll press on the text message you want to unsend until a menu pops up. You'll then select Undo Send from the menu.
Permanently Erase Deleted Messages on iPhone, Unrecoverable! Text messages, or any other data for that matter, are not really deleted from your system after you remove it in the usual manner. The data still remains in the memory that can be easily retrieved using various data recovery software.
On your iPhone:
To delete a single conversation, swipe left on the conversation that you want to delete.
Step 1: Open Messages App on your iPhone. Step 2: Open a conversation and find the message you'd like to delete. Step 3: Hold and press the message you'd like to delete and choose More. Step 4: Click the Trash icon and choose Delete Message to remove the message.
"To delete a single conversation, swipe left over the conversation that you want to delete, tap Delete, then tap Delete again to confirm. To delete more than one conversation, open Messages and tap Edit in the upper-left corner. Then tap the circle next to the conversations and tap Delete in the bottom-right corner."
1 Delete a Message