Smartphone Questions? Ask A Smartphone Technician for Answers
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This usually happens if the firmware is glitched. First we can reset your iPhone and see if it works or not. Press and hold down the Power button and Home button at the same time until it shows the Apple logo. When you see the Apple logo, release the buttons and let it boot. This should fix it.
Please let me know if that didn't work, so we can continue troubleshooting.