Libelium GPRS module data transfer

Hi all,

I have the GPRS modem shield from Libelium and have been able to get it to do most things. I've run through the tutorial and have sucessfully completed all of this.

I wish to use it to make or recieve a data call, that is, dial into it from say hyperTerminal and use it as a serial link. This should be possible with the right SIM card. I have not had any luck doing this as yet and was wondering if anyone else had had success with this.

Any help would be appreciated.