I have a Sprint Mogul, and it's a great phone. It works as expected. It only until recently I start having problem. The problem I have is when I set the phone to roaming only, I cannot dial out or receive any call. When someone try to call me, the person hears few rings and it goes to voice mail. When I tried to dial out, it does rings a few time also, then Verizon says they cannot authenticated my device. I have hard reset and also flash the phone to the latest update, and it didn't solve the problem. I have contacted Sprint regarding this, but they are no help either. Does anyone else experience this before? How do you fix it? Thanks.