Hi All I have a major issue with Galaxy S4 phone. I cannot make or receive calls I am not sure what happened but out of the blue every time I try to make a call I select contact or no press call button and the phone display shows dialling for a couple of seconds and then immediately shows call ended and hangs up note I never hear a ring tone. I cannot receive calls either if someone trys to ring me I have no clue as the phone does not respond at all if i call my own number I just get one long continuos tone but there is no missed call recorded on my phone, it is weird. I have gotten a new sim, factory reset, I have sent for repair and came back exactly the same though they note they replaced coaxial cable and module sub pba and upgraded software I don't know what that means but the problem is still there. I would be very grateful for any help given.