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You should be able to use it, but with T-MO you will probably only get "EDGE" speeds. "EDGE" is another way of saying slow as molasses 2G, but at least it sounds fast. On the other hand, it sounds as if you are not really into the best performing hardware, and if you are in a WiFi rich environment, you can just use WiFi connections for everything. You don't even need to have a carrier. And, of you install a VoIP app such as GrooVe IP, you can still use it for voice calls too, as long as the WiFi speeds are reasonable.