Iphone cuts out

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I have worked selling cell phones for the 14 years. The biggest problem that I have seen is people putting there phones in their pants pocket. When bend over or sit down pressure gets applied to the phone. Screens crack or black or white, and sometimes features stop working because of the amount of pressure applied over time.
If you put your phone in your pocket get a case you can put on your belt or your purse.

Try going into Settings/general/reset and reset network settings.