Today, smartphones mainly fulfill their users' needs for a telephone, digital camera and video camera, GPS navigation, a media player, clock, news, calculator, web browser, handheld video game player, flashlight, compass, an address book, note-taking, digital messaging, an event calendar, etc.
A mobile operating system (OS) is software that allows smartphones, tablet PCs, and other devices to run applications and programs. A mobile OS typically starts up when a device powers on, showing a screen with icons or tiles that present data and provide application access. Mobile operating systems also handle cellular and wireless network connectivity, as well as phone access.
Examples of mobile device operating systems include Apple iOS, Google Android, Microsoft’s Windows Phone OS, Research in Motion’s BlackBerry OS, Hewlett-Packard’s WebOS (formerly Palm OS) and Nokia’s Symbian.
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