Check it out, the iPhone 5 is thinner and compared to other smartphones since the iPhone 5 is in direct competition with Samsung Galaxy S3, which boasts a 4.8 inch super AMOLED display. iPhone 5 is expected to be just 7.6mm thick, a full millimeter less than the Samsung Galaxy S3, which is 8.6mm thick. It is also a pretty safe bet to assume that the iPhone 5 will come with at least a 4-inch display to stand equally with S3.