what do you mean with that? I think we'll still be able to use t-mobile with the unlocked iphone4s (EDGE). The problem is, siri might be working very slow due to the network connection's speed. However, there's a rumor that the iphone 4s is using a new chip, something about q6610 instead of q6600 (not sure about the series), which rumored that it might be able to receive t-mobile's 3g's frequencies, sweet! 😎