Can you provide more information about your setup and what you have done so far.
The following would be useful:
Number of serial ports on the machine your using
Model and Make of the GSM modem
Any setup you have already done.
If you only have 1 serial port then it should be detected as the device /dev/ttyS0
When you run minicom I believe that by default it looks at the device /dev/modem which is normally a symlink to your modem device. It may be the case that this file does not exist on your system. If it does not then I would suggest linking it to the first serial tty device using the command below.
Quote:
ln -s /dev/ttyS0 /dev/modem
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Then run minicom again this may allow you to access the device.
Regards
Lee