HUAWEI Vision U8687 4GB Unlocked GSM Android v4.0 Smartphone - Black 2G: GSM 850 / 900 / 1800 / 1900, 3G Network: HSDPA 850 / 1900 / 1700 (AWS) 3.5" TFT Display Capacitive Multi-Touchsscreen Android v4.0 (Ice Cream Sandwich), 1 GHz Cortex-A5 Processor, Chipset: Qualcomm MSM7225A Snapdragon 3.2 Megapixel Camera (2048 x 1536 pixels) Internal Memory: 512 MB RAM, 4GB ROM (2.71GB user available) + 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.