HT203031: Where do I find my Case or Repair ID?
Learn about Where do I find my Case or Repair ID?
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Helpful answers
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Nov 3, 2014 3:16 AM in response to heropemby Ingo2711,To rule out a software issue, try to set it up as new device, without using the latest backup afterwards, explained here:
iOS: How to back up your data and set up your device as a new device
If this does not work, your phone needs to be checked by Apple or an Authorized Apple Service Provider.