What iPhone model do I have? How to figure it out
Find your iPhone model: Look for the 'A' model number on the back or in the Settings app to determine which iPhone version ...
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How to restart, force restart, or reset any iPhone model
It might sound like a joke, but it's true: You can fix most tech problems by turning your device off and back on again. If you run into a weird glitch on your iPhone — maybe the sound won't work ...