The smallest iPhone currently available is the iPhone SE (3rd generation), which has a 4.7-inch display and measures 5.45 by 2.65 by 0.29 inches. The iPhone 13 mini, which was the smallest iPhone until it was discontinued, had a 5.4-inch display and measured 5.18 by 2.53 by 0.3 inches. It is worth noting that there are smaller phones available on the market, such as the iLight Mini Smartphone and the Mini SmartPhone Melrose XS, but these are not official Apple products.