Question: what are the different types of mobile phone operating systems?
Answer: Android OS (Google Inc.) ... 
2. Bada (Samsung Electronics) ... 
BlackBerry OS (Research In Motion) ... 
iPhone OS / iOS (Apple) ... 
MeeGo OS (Nokia and Intel) ... 
Palm OS (Garnet OS) ... 
Symbian OS (Nokia) ... 
webOS (Palm/HP)