You can certainly spoof subscriptiony identity module information, in many different ways, that won’t flag your attempt as an emergency call.
In general, the whole gsm-concept works on the idea that it’s safe as long as only phone operators have access. And the safety from outside attacks are basically that the access protocols are obscure, and that it stores all information (as well as calls, all location data, the specific device’s information that uniquely identifies you by name, etc.). So it’s “thought” that unauthorized use, spoof gsm points and various wrapper-protocols are not in use. Meanwhile, with tons of new mobile companies and temp-IDs in the network that basically are wrappers or forwarding for the companies that rent out, etc., there’s just no security whatsoever. (Although trying to cheat AT&T is probably more risky than cheating the feds..).
But using the emergency function to get free calls is a bit like hijacking a police-helicopter to skip the bus. It’s not a good idea if you don’t want to get caught.
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