Dell Venue Pro 8GB Unlocked GSM Windows 7.5 Slider Smartphone - Black 5 Megapixel Camera (2592 x 1944 pixels) w/ Autofocus, LED flash + Video Internal Memory: 8GB storage, 512 MB RAM, 1GB ROM + microSD Slot Expandable up to 32GB (not user accessible) Full QWERTY Keyboard 4.1" AMOLED Multi-Touchscreen w/ Protective Corning Gorilla Glass 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 900 / 1700 / 2100 Microsoft Windows Phone 7, 1 GHz Scorpion Processor, Chipset: Qualcomm QSD825 Snapdragon, Adreno 200 Graphics 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.