[atulagarwal]

In my understanding, it needs operator level access to control the modem, or is it also possible to control the model using a MITM like scenario (off the air interception). If the latter is possible, it can become all the worrisome! Any ideas?

[mschuster91]

Yeah, of course. Calls itself IMSI Catcher (the variant used by police/secret service). You can build one yourself with OsmocomBB and the rest of that open-source GSM network infrastructure stuff.

Voila, there is your operator-level access from the radio side.