I have to check it again because I have been quite busy with other issues but it seems it is possible to make it.

The command "pnatd" enables sending AT commands. It opens a serial port (I think it is a pts master/slave model). Then you can use this interface through any program to get/set thinks on the modem.

The AT commands set is defined by the 3GPP TS 27.005 and 27.007 specs, if I remember correctly.

Please keep us informed of any progress. I will try to do the same