Okay, I have a Nokia XpressMusic phone, which was my stepfathers old phone. Been using it for a few months. The other night i left it in the car. It got really cold and started dropping calls after like 30 seconds of talking. So I went to walmart and bought a gophone - until i can get another that i like for a good price. Well I brought the phone back home - inserted my sim - and that phone isnt working with the sim eather - still dropping calls. So i put the gophone card back in it - and was going to call my mom to find out where i need to go to get the sim card replaced, and it wouldnt call at all. IDK! Im boggled. My nokia will have perfect service one minute and then 30 seconds later - none, not even a bar. Has this ever happened to someone?