So, my iPhone is a 3gs and is jailbroken. All of a sudden my phone read 'no service' or 'searching… ' and wouldn't connect to T-Mobile. I took out the sim card and turned it on and off and rebooted it but nothing worked. But, here's the weird part, this only happens when I'm in my house. I went to school and it started working just fine. The service came back and I could text/call and everything. But the moment I get home (or into the area around my home) the service stops working again. And this did not happen after I upgraded it. If anyone could help I'd really appreciate it!
Added (1). OH and I put the sim card into an old phone and it worked just fine while I was at my house.