This phone (G928A) is fully compatible with AT&T. Other GSM carrier like T-Mobile that use SIM card needs to check for compatibility before place the order (You might need to change the APN setting to get data and internet);It does not work With CDMA carrier like Verizon or Sprint;3G bands: HSDPA 850 / 1700(AWS) / 1900 / 2100 - G928A;4G bands: LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 12(700), 17(700), 20(800) - G928A;(Screen Size 5.7 inches) (Internal 32GB, 4 GB RAM) (Primary Camera 16 MP, f/1.9, 28mm)