HTC One 32GB Unlocked GSM 4G LTE Android Smartphone - Vivid Blue 4G LTE: LTE 700 / 850 / 1700 / 1900 / 2100 4.7" Super LCD3 capacitive Multi-Touchscreen, HTC Sense UI v5, protective Corning Gorilla Glass 2 Beats Audio sound enhancement 32GB internal memory storage, 2GB RAM Android v4.3 (Jelly Bean) OS, Quad-core 1.7 GHz Krait 300 processor 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.