The following mobile device operating systems are commonly available with the following feature highlights:Android- Is open source, the leader in mobile device operating systems. - Google Play Store has the most mobile apps.- Android manufacturers are countless, including Samsung, Song, HTC, LG, Motorola, etc. iOS- Is closed source, second in mobile device operating systems. - Close competitot to Google in AppStore mobile app count. iOS devices or iPhones are solely designed and developed by Apple.Windows- Is closed source, far behind Android and iOS in mobile device operating system popularity.- Windows Store has fewest mobile apps. - Microsoft Mobiles (formerly Nokia) are the leading Windows Phone providers. Though Samsung and HTC have launched Windows phone devices in the past. Google is not a mobile device operating system; Google uses the Android operating system.