Nokia Lumia 928 32GB Unlocked GSM 4G LTE Windows Smartphone - Black 32 GB, 1 GB RAM, 8 MP, 3264 x 2448 pixels, Carl Zeiss optics, optical image stabilization, autofocus, xenon flash SIM Micro-SIM 4G Network LTE 700 MHz Class 13 / 1700 / 2100 LTE 800 / 900 / 1800 / 2100 / 2600 3G Network HSDPA 850 / 900 / 1900 / 2100 CDMA2000 1xEV-DO 2G Network GSM 850 / 900 / 1800 / 1900 CDMA 800 / 1900 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.