Samsung Galaxy Ace S5830 GSM Unlocked Android Smartphone- White 3-inch TFT LCD capacitive touchscreen, DNSe sound enhancement, Stereo FM radio with RDS This unlocked cell phone will work on GSM carries like AT&T and T-Mobile. Not all carrier features may be supported. Does not come with Sim card Unlocked Quad-Band GSM cell phone compatible with 850/900/1800/1900 GSM and HSDPA 900 / 2100MHz MHz 3G 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.