Nokia Lumia 1020 RM-875 GSM Unlocked 32GB 4G LTE Windows Smartphone - Black GSM 850 / 900 / 1800 / 1900, 3G Network: HSDPA 850 / 900 / 1900 / 2100, 4G Network: LTE band 1(2100), 3(1800), 7(2600), 8(900), 20(800) 4.5" AMOLED Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 4.5&quot; AMOLED Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 Microsoft Windows Phone 8, upgradeable to WP8 Black, Dual-Core 1.5 GHz Krait Processor, Chipset: Qualcomm MSM896 Snapdragon, Adreno 225 Graphics GSM 850 / 900 / 1800 / 1900, 3G Network: HSDPA 850 / 900 / 1900 / 2100, 4G Network: LTE 700 / 850 / 1700 / 1900 / 2100 Internal Memory: 32GB, 2GB RAM 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.