The iPhone 4, pocket-sized power. People dreamt about video calling for decades, the iPhone 4 made it a reality. With just a tap you can wave hello to your kids, share a smile from across the globe or watch your best friend laugh at your stories. The Retina display on iPhone 4 is vibrant, high-resolution, with a high pixel count. In fact, the pixel density is so high that the human eye is unable to distinguish individual pixels. Which makes text amazingly crisp and images stunningly sharp.