I am in a remote area of Kentucky and have had no previous trouble with my service and all of a sudden, I was unable to text in-or-out, nor was I able to make a call or receive a call. I had 4 bars of service and was able to check email and surf. When I tried to call out the message given to me said, "Were sorry you not authorized to use this cellular service. Please contact your home carrier for more information." What do I do?