Just when you thought a smartphone couldn’t get any better, it just did. The iPhone 4S is sure to change the way you communicate. The Siri technology lets you to talk to your smartphone as you would talk to a person, turning your phone into a persona l assistant. The powerful dual-core A5 chip ensures a lightening- fast performance and life-like graphics. Shoot 1080p HD videos and click crystal clear snaps with the 8 -megapixel camera. 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.