I am not able to receive or make calls out on my phone. What should I check?

[iMore Question]

I have an IPhone 6S

 

[pkcable]

Have you tried a simple reboot/restart of the phone? That is hold the home button and power button at the same time for about 10 seconds until the Apple logo appears. Also you might try turning on airplane mode waiting 30 seconds then turning it back off, this will cause your phone to try to reacquire its signal.