The Amazon Fire Phone comes with an unlocked SIM card and can be used with T-Mobile's cellular service. The unlocked phone does not require the buyer to enter a contract or commit to a specific network.
The unlocked Fire Phone is not locked to any one cellular network and works with all GSM-based carriers in the United States. These include such major carriers as T-Mobile, AT&T and MetroPCS. Since buyers do not need to enter a contract to purchase the unlocked phone, it sells at full price and the cost is not reduced or otherwise subsidized. The unlocked phone does not work with Verizon or Sprint, as those carriers use a different radio technology.