If you want to recover a text message, tap on the thread or message so that it's selected, hit Recover on the bottom right, and then tap Recover Message in the pop-up that appears. You can also ...
Here's how to delete individual messages and conversations on your iPhone's Messages app, with steps to set up an auto-delete ...
You can swipe to delete messages in the iPhone's Mail app, but you'll need to enable this option in Settings.
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