Thanks for the reply. Indeed, I use usb_modeswitch under Linux, it is, however, quite just for Linux, cause it reloads a certain kernel module. With GENERIC kernel, usb_modeswitch does not even recognize the device. However, compiling it (the kernel) without umass support, that is, the device being ugen, it does.
Now, when I boot GENERIC with the modem plugged-in, then I get the microSD that is 'inside my modem' (not the cd-rom device) recognized, but no modem... If any idea would be wonderful, and sorry for my horrible english.