Maybe put your carrier as Automatic? Maybe you accedendently put Rogers only? Or blacked roaming totally.. Which you would need need to contact Rogers to unblock.. There should be AT&T service in buffalo..
Even if the carrier is Automatic, it still should connect you with ATT..My guess would be either there is a issue with the account not letting the user connect to ATT OR in the settings, they have only picked Rogers.
yeah and in the event it does not automatically select the usa carrier, you can simply go into network scan choose manual network scan and select a us carrier from the list, ie: at&t, cingular, t mobile, verizon, sprint, etc. and the phone should force itself on the carrier provided there is a roaming agreement in place