I was in a class today where I had no service but was on my school's Wifi. When I left class and went outside I got service again and was able to call my dad. When I got home my dad told me that he called me after that but the line was busy. So I tired calling myself from my home phone and there's no dial tone and the phone doesn't ring. My dad sent me a text too and I haven't gotten it. I've tried turning it off and doing a hard reset. I had 5 bars of service and 3G and can make calls but incoming calls/texts won't come through. Anyone have any idea of what to do?