thats what i did (bought some US minutes before i came down) i always do. But when i had the sim in my razr it said cingular was my provider. when i threw it in the iphone (which i jailbroke it with the at&t sim in.....then put my rogers card in and unlocked it). It says At&T. thats why i thought it was weird.
My other question is so what itunes (ver) do i need to run now? i have a macbook that i am using to charge it but have not connected it to itunes (i just decline opening it)(its a brand new itunes install from before i got the iphone).
Im just using it wifi now. its pretty sweet. just curious why it switched carrieres from verizon (with my razr) to at&t with my iphone. Using the same sim.