A mobile phone operating system (OS) manages device functions, multitasking, and app compatibility. Popular OS options include Android (customizable), iOS (Apple-exclusive), Harmony OS (Huawei), and others like Blackberry, Windows Mobile, and Symbian, many now discontinued. Choosing the right OS ensures optimal performance and compatibility with apps and features. https://techimpo.com... https://www.slideshare.net/slideshow/different-types-of-operating-systems-used-in-mobile-phones/273931742