does T-mobile use sim cards?
correction you can use the sim cards on unblocked phones (unblocked meaning that there is no special carrier for that phone or it is unblocked by way of a Box)
just be sure the phone has the bandwidth of your state/country
T-Mobile does use sim cards, and you cant use them on any phone from a different carrier.
yea it can work on any phone as long as its not a blocked phone