Samsung's Galaxy S III phones work on T-Mobile's network. Samsung Galaxy S III phones are available new and used from T-Mobile's official website and from online retailers such as Amazon.com. Unlocked Samsung Galaxy S III devices from some other networks are also compatible with T-Mobile's network.
Unlocked Samsung Galaxy S III devices with a valid IMEI number may be activated on T-Mobile's network. Phones obtained through independent sellers at flea markets, on eBay, or on the street may not be eligible for activation on T-Mobile's network. When purchasing unlocked devices it is recommended to buy only from sellers with good buyer feedback or from official retail partners.