It seems whenever I call an individual, It'll ring twice, then go to a busy signal. People on the other end say their phone dosen't ring or it does and they answer and get no connection. This new phone is an unlocked MetroPCS phone that's on AT&T now. The seller says it could be because I use the area code for local calls, but I just tried a number with a different area code and it does the same thing. I can call out sometimes, usually to businesses. It has Android 5.1.1. Any suggestion would be appreciated.