Delete everything and start over
If nothing seems to be fixing the problem, the nuclear option is to restore your phone to factory settings. You’ll essentially be returning it to the way it was when you bought it, so be sure to back up all your contacts, photos, music, and other media you don't want wiped to your computer or iCloud beforehand. When you're ready, go to General Settings, scroll down to Reset, click Erase All Content and Settings and follow the prompts.
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Joe McGauley is a senior writer for Thrillist. He's convinced that violently shaking and screaming at your phone when it's messed up works, too.