thanks omppuhauki your solution works like a charm on my imac with OS 10.8.2 and my old Huawei E220 which I now use with sms server tools 3.
I have one question though !
each time I plug my modem in, OSX display a dialog window saying :
"the disk you inserted was not readable by this computer
[ignore] [eject]".
I ignore and everything works fine, but would anybody know how to get rid of this dialog ???
I have the same problem too.
Nevertheless, the modem works.