An OS is the main system software that allows your device to run. It determines how everything on the screen is laid out and how your device functions. It also gives you access to apps that are designed for your device's OS.
Examples of different operating systems include Android™, Apple® iOS and Windows®.
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Operating System (OS) FAQs
What is an operating system (OS)?
What are the current versions of each smartphone OS?
Where can I learn about the features of the current smartphone OS versions?
How do I know what OS my device has?
What's the difference between an OS update (system update) and a software update?
How do I know when an OS update is available for my device?
Why should I update my device OS?
Can I revert to a previous OS version on my device?
Android is a trademark of Google, Inc. Use of this trademark is subject to Google Permissions.
iOS is a trademark or registered trademark of Cisco in the US and other countries and is used under license.
Windows Phone is either a registered trademark or trademark of Microsoft Corporation in the United States and/or other countries.
Apple is a registered trademark of Apple Inc.