A smartphone is a handheld personal computer. It possesses extensive computing capabilities, including high-speed access to the Internet using both Wi-Fi and mobile broadband. Most, if not all, smartphones are also built with support for Bluetooth and satellite navigation. Modern smartphones have a touchscreen colour display with a graphical user interface that covers the front surface and enables the user to use a virtual keyboard to type and press onscreen icons. Interaction is mostly done using touch, besides a few physical buttons. Smartphones are typically pocket-sized, with somewhat larger sizes being called phablets; they are generally smaller than tablet computers. Smartphone function using a rechargeable lithium-ion battery.
Smartphones use a mobile operating system and are able to process a variety of software components, known as “apps”. Most basic apps (e.g. event calendar, camera, web browser) come pre-installed with the system, while others are available for download, either for free or charging money to one’s balance, from official sources like the Google Play Store or Apple App Store.