the sim will also work in t mobile phones but you must get the phone unlocked and you might not get 3G speed only edge speed.
In that case it is hardly worth doing. With ATT it works on all their Android/Apple phones. Talk and text right off and 3G with the APN change, Locked or unlocked phones. Why bother with a T Mob phone if you know you are going to have a crippled phone in the end.
Is there a way to do custom avatars? I want to use a picture of the Precedent but there are none in the Avatar list from the forum, Only the Prevail and it has the boost logo on it.