I have a android device and have tried or possess all these except blackberry rim
Read more at mobile.pcmag.com
"The worldwide mobile OS market is dominated by four players: Symbian, Android, Research In Motion and iOS," said Roberta Cozza, principal research analyst at Gartner, in a statement. "Launches of updated operating systems — such as Apple iOS 4, BlackBerry OS 6, Symbian 3 and Symbian 4, and Windows Phone 7 — will help maintain strong growth in smartphones in 2H10 and 2011 and spur innovation. However, we believe that market share in the OS space will consolidate around a few key OS providers that have the most support from CSPs and developers and strong brand awareness with consumer and enterprise customers."