Before revision: Custom ghifari Timeline Mobile operating system milestones mirror the development of mobile phones, PDAs, and smartphones: Pre-1990 1990–2010 – Mobile phones use embedded systems to control operation.
After revision: Mamahgggtist4Custom ghifari Timeline Mobile operating system milestones mirror the development of mobile phones, PDAs, and smartphones: Pre-1990 1990–2010 – Mobile phones use embedded systems to control operation.