Ever since i updated to 3.1 my iphone 3g randomly stops makeing/receiving calls and texts. When it acts up, the signal strength is full 5 bars but i cant make a call and anything incoming doesnt work. Calls go straight to voicemail and texts dont show up until i reset the phone! I even downgraded back to 3.0.1 and its still doing it. I think it may have something to do with the baseband change that is part of the 3.1 update? DO anyone know how to fix this issue? Because it has me really frustrated and i'm about ready to sell my iphone because of it.