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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 color 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. Smartphones function using a rechargeable lithium-ion battery.