Samsung Gravity TXT SGH-T379 GSM 3G Used Cell Phone T-Mobile No contract T-Mobile cell phone ready to activate on T-Mobile wireless Excellent Conditioned Pre-Owned Phone, You Will Be Very Satisfied Used no contract T-Mobile Cell Phone Full 30 day customer satisfaction warranty Please contact us with any questions and we will reply ASAP Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.