Smartphone Questions? Ask A Smartphone Technician for Answers
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Is this is an Apple iPhone ?
If this is an iPhone, then follow the steps below to fix it
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 will fix it.
Please let me know if that didn't work, so we can continue troubleshooting. If this is not an iPhone, please let me know.