HTC One VX Unlocked GSM 4G LTE Android Smartphone - Gray/Red 3G: HSDPA 850 / 1900, 4G: LTE 700 MHz Class 17 / 1700 / 2100 4.5" Super LCD2 Capacitive Multi-Touchscreen Android v4.0 (Ice Cream Sandwich), Dual-Core 1.2 GHz Processor, Chipset: Qualcomm MSM893 Snapdragon, Adreno 305 Graphics 5 Megapixel Camera (2592 x 1944 pixels) w/ Autofocus, LED flash + Front-Facing VGA Camera + Video Internal Memory: 8GB, 1GB RAM + microSD Slot Expandable up to 32GB 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.