I have a nokia 3650 from TIM (italy) phone appears to be unlocked. I can use a TIM card, i have used At&t and Cingular in the states. But i tried my US T-mobile sim cards and the phone starts but then freezes after the nokia logo. I tried 5 different T-mobile sims and they all did the same thing, then i tried the others and they still work. Any suggestions? Is the firmware not compatable somehow? T-mobile sims have higher k or something. Im just throwing things out because im stumped. And the t-mobile sims are good i use them in other phones. Its using firmware v 2.50 which i know is older but has always worked fine. Any help would be appreciated.