The Apple iPhone 4 runs on iOS operating system. It features 3.5-inch display with 640 x 960p resolution provides clear visuals. With a 5MP front camera and a VGA secondary camera, this iPhone is great for taking images and videos. It has an internal memory of 32GB for storing music, images, videos and other media files. This device is locked to EE and compatible with Vodafone, O2, Three Carriers.