I have a jailbroken/unlocked iphone 3g being used on T-Mobile. About 2 days ago the phone started losing signal after I make a call. I would have almost full bars and I make or recieve a call and talk for as long as I want without interruption. But about a second or two after I hit end call my phone goes to "searching". It does find the signal again in about a minute though. I tried turning my phone off and then on again. I also tried "Reset all Settings" in "General". But it still has the same problem. Any one know a solution?