commonly considered a mobile OS (operating system).
Some commonly considered mobile OS (operating systems) are:
1. Android: Developed by Google, Android is an open-source operating system used by many smartphone manufacturers such as Samsung, Xiaomi, and Huawei.
2. iOS: Developed by Apple, iOS is the proprietary operating system used exclusively on Apple's iPhone, iPad, and iPod devices.
3. Windows Phone/Windows 10 Mobile: Developed by Microsoft, Windows Phone was the operating system used on Microsoft Lumia smartphones. However, Microsoft discontinued the development and support for Windows Phone in 2017.
4. BlackBerry OS: Developed by BlackBerry Limited, BlackBerry OS was the operating system used on BlackBerry smartphones. However, BlackBerry discontinued the development and support for BlackBerry OS in 2015 and transitioned to using Android on their newer devices.
5. KaiOS: KaiOS is a feature phone operating system that is gaining popularity, particularly in emerging markets. It is a lightweight OS that offers limited smartphone-like functionalities on feature phones.
6. Tizen: Developed by Samsung in collaboration with other companies, Tizen is an open-source operating system used primarily on Samsung's smartwatches and some smartphones.
These are some of the commonly known mobile operating systems, but there are also various other lesser-known and niche operating systems available for mobile devices.