i upgraded my iphone 2g to the 3.0 firmware using beta 5 everything worked perfectly and everything on my iphone works even the wifi but when i put my t-mobile sim card it just shows that i have no service and i cant make calls or texts or recieve them. i even tried putting in my moms at&t sim card and the same thing happened what do i do to fix this and get service? also when i go to settings general settings and about my network says not available. how do i make the simcard network work? thanks.