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Developed by Danger Incorporated, Danger OS was a Java-based OS used on phones that Danger designed by themselves, these . These devices were sold under many names such as Hiptop, Mobiflip, Sharp Jump , and (most notably, ) T-Mobile Sidekick. Danger OS was a Java based OS and while While it could run some J2ME apps (OS from version 2.3+onward), it also used it's its own proprietary J2SE -based APIs and SDK, ; for this reason, anything built using these APIs won't run on a standard J2ME emulator.

Released in 2000 by Microsoft as their first mobile OS, originally called "Pocket PC" and made to run on PDA's, the name changed to Windows Mobile when the PDA market started began to die offshrink. WM was initially based on Windows CE before evolving into something unique. WM It was mainly designed for business users, do to this, not so it didn't have a lot of games were made for it.