This short video shows you the milestone of Mobile operating system development since 1996 until 2007. It shows you the short history of mobile OS.
History of Mobile Operating System (1996-2007)
The mobile operating system battle
TechNspec - Mobile Operating Systems
Ubuntu Phone OS Hands-On Demo
Speedarts - Custom Mobile Operating System [1080p]
Top 10 Mobile Operating System
Sailfish Mobile OS - Jolla Revives MeeGo for Phones