Sony Xperia Ion LTE LT28a 16GB Unlocked GSM Dual-Core Android Smartphone w/ 12MP Camera - Black 3G: HSDPA 850 / 1900 / 2100, 4G: LTE 700 / 1700 / 2100 (Bands 4, 17) 4.55-inch LED-backlit LCD Multi-Touchscreen w/ Scratch-Resistant Glass, Sony Mobile BRAVIA Engine and Timescape UI Android v4.0 Ice Cream Sandwich (upgradable to JellyBean); Dual-Core 1.5 GHz Processor, Chipset: Qualcomm MSM826 Snapdragon 12 Megapixel Camera (4000 x 3000 pixels) w/ Autofocus & LED Flash + Front-Facing 1.3 Megapixel Camera Internal Memory: 16GB, 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.