Samsung Google Nexus S Smartphone with US 3G, 5MP Camera, Android OS, Touch Screen - No Warranty - Black Frequency: GSM Quad-band: 850/900/1800/1900 MHz; UMTS Tri-band: 850/1900/2100 MHz Gingerbread pre-installed,Latest Google Mobile apps. 1 GHz processor, 16 GB of internal memory Brilliant 4" contour display 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. Wi-Fi 802.11 b/g/n connectivity. It works on 2G for only GSM carriers and 3G for AT&T and any carriers that use the same bands.