“Take your smartphone, for instance. There’s definitely a primary OS — Android, iOS, Windows Phone — but there’s also at least two other operating systems: The baseband OS and the SIM card OS, both of which run on their own processor that’s separate from the SoC.  [..] REX OS automatically executes any commands that it receives over-the-air from the carrier’s base station — and yes, in case you were wondering, there are commands that perform a variety of heinous acts, such as turning on auto-answer, executing arbitrary code, or simply bricking your device. It goes without saying that, in theory, you could set up your own base station and cause a lot of havoc.”

http://www.extremetech.com/computing/170874-the-secret-second-operating-system-that-could-make-every-mobile-phone-insecure

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