Apple iPhone4S 16GB black - SIM unlocked Black|This follow-up to the very popular iPhone 4 features a faster Apple A5 dual-core processor and better 8 megapixel camera|The iPhone 4S also features Siri - a voice assistant heeding natural-language questions and commands, and taking dictation|Other features include a gorgeous 3.5-inch high-resolution display, iPod music player, Wi-Fi, and 16GB of of internal memory 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.