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How do you do queries for 3G modems in linux? Myself, I always disassemble my 3G modem, remove the SIM card, put it in my mobile, do what I need and then reverse the whole procedure. It is not fun .

I suggest to add the ability to do USSD queries to the Knetworkmanager.

There is some scripts do that but they are far from be usable.
http://github.com/JochenHoch2/gsm-ussd [ http://linux.zum-quadrat.de/ ]
http://sourceforge.net/projects/ussdq/