A smartphone is a mobile phone that performs many of the functions of a computer. It typically has a touchscreen interface, internet access, and an operating system capable of running downloaded applications. Smartphones can access the internet, have apps for various functions, and some can connect to mobile networks like 3G and Wi-Fi. They come in screen sizes ranging from 7 to 10 inches and popular examples include the iPhone and Android devices. Tablets are similar but have larger screens, typically ranging from 7 to 10 inches.