A smartphone is a portable 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, and multimedia functionality, 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, 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.

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