If you set up WhatsApp to create a backup, you have the option to recover deleted messages on the app.

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 ...

You can recover deleted photos on iPhone from the Recently Deleted folder in the Photos app or a backup on iCloud, iTunes, or ...