Performing a force restart can sometimes resolve that- (Press and hold the Power and Home buttons simultaneously for 20 seconds until the Apple logo appears)
Otherwise contacting Apple by phone or store would be the next best option to look at repair options
Being able to count on your phone is always crucial. That's way too long to be without a working device. We're glad to help find a solution. What happens when you try plugging the phone into the charger or powering it up? Can you think of any changes or anything that happened to the device around the time this started?
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