The iPhone 4 is the fourth generation iPhone. iPhone 4 features a 3.5-inch LED backlit Retina display with a 960×640 pixel resolution. The iPhone 4 runs Apple's iOS operating system. It is mainly controlled by a user's fingertips on the multi-touch display. The iPhone 4 is structured around a stainless steel frame that wraps around the edge of the phone. Your iPhone 4 may become wear and tear after long-time use. ETrade Supply provides the new iPhone 4 (AT&T/GSM) replacement parts, which are good substitute for your cracked, damaged or unusable parts.