A smartphone is a portable computer device that combines mobile telephone functions and computing functions into one unit. They are distinguished from older-design feature phones by their more advanced hardware capabilities and extensive mobile operating systems, which facilitate wider software, access to the 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-installed and third-party software , and support wireless communication protocols . More recently, smartphone manufacturers have begun to integrate satellite messaging connectivity and satellite emergency services into devices for use in remote regions where there is no reliable cellular network.