Release Date: Oct 2011
OS: iOS (7.x, 6.1, 6, 5.1, 5)
Screen Size: 3.5 inch
Resolution: 640 x 960 pixels
Camera: 8 megapixels
Available in black and white, iPhone 4s features an A5 chip, an 8MP iSight camera, and Siri, the intelligent assistant you control with your voice.
iPhone 4S is the fifth generation of the iPhone succeeding the iPhone 4 and preceding the iPhone 5.
Siri lets you use your voice to send messages, schedule meetings, place phone calls, and more. Ask Siri to do things just by talking the way you talk. Siri understands what you say, knows what you mean, and even talks back.