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There are actually two operating systems in every phone

Any phone with mobile communications capability  has 2 operating systems. Aside from the operating system that we as end-users see (Android, iOS, PalmOS), it also runs a small operating system that manages everything related to radio.

 

http://mobile.slashdot.org/story/13/11/13/0237214/the-second-operating-system-hiding-in-every-mobile-phone

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