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Dec 16, 2015 5:51 AM in response to cahsaraivaby Ingo2711,If the suggestions in this article ddi not work, setting it back to factory settings without using the backup would be the next step to try, to make sure that this is not software related.
If you can't connect to a cellular network or cellular data - Apple Support
Use iTunes to restore your iOS device to factory settings - Apple Support
If it still does not work after that, this might be a hardware issue and the phone has to be serviced by Apple or an Apple Authorized Service Provider: