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OverviewA smartphone is a portable computer device that combines mobile telephone and computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems, which facilitate wider software, internet (including web browsing over mobile broadband), and multimedia functionality (including music, video, cameras, and gaming), alongside core phone functions such as voice calls and text messaging. Smartphones typically contain a number of metal–oxide–semiconductor integrated circuit chips, include various sensors that can be leveraged by pre-included and third-party software (such as a magnetometer, proximity sensors, barometer, gyroscope, accelerometer and more), and support wireless communications protocols.Early smartphones were marketed primarily towards the enterprise market, attempting to bridge the functionality of standalone personal digital assistant devices with support for cellular telephony, but were limited by their bulky form, short battery life, slow analog cellular networks, and the immaturity of wireless data services. These issues were eventually resolved with the exponential scaling and miniaturization of MOS transistors down to sub-micron levels, the improved lithium-ion battery, faster digital mobile data networks (Edholm’s law), and more mature software platforms that allowed mobile device ecosystems to develop independently of data providers.In the 2000s, NTT DoCoMo’s i-mode platform, BlackBerry, Nokia’s Symbian platform, and Windows Mobile began to gain market traction, with models often featuring QWERTY keyboards or resistive touchscreen input, and emphasizing access to push email and wireless internet. Following the rising popularity of the iPhone in the late 2000s, the majority of smartphones have featured thin, slate-like form factors, with large, capacitive screens with support for multi-touch gestures rather than physical keyboards, and offer the ability for users to download or purchase additional applications from a centralized store, and use cloud storage and synchronization, virtual assistants, as well as mobile payment services. Smartphones have largely replaced PDAs, handheld/palm-sized PCs, portable media players (PMP)[1] and to a lesser extent, handheld video game consoles.Improved hardware and faster wireless communication have bolstered the growth of the smartphone industry.