Sony Xperia Z Ultra C6806 Google Play Edition 16GB (Factory GSM Unlocked) 4G LTE Android Smartphone - Black 6.4" Huge Display 2.2 GHz Quad Core Processor 8Mp Rear Camera 2Mp Front Camera Water Resistant Unlocked cell phones are compatible with GSM carriers such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint.