Samsung T379 'Gravity TXT' Unlocked Cell Phone - Black/Yellow. (2G: GSM 850 / 900 / 1800 / 1900 ) This cell phones are fully compatible with T-Mobile. This phone does not work with AT&T, H20 and other carriers that do not support 2G Bands. 2G: GSM 850 / 900 / 1800 / 1900 This GSM Unlocked cell phones will not work with other CDMA Carriers like Verizon, Sprint, Boost or Virgin. Check with your carrier for compatibility of the phone before place the order.