Could one of the programs under the links in the "Phonebook editing and backup" paragraph of
this web page possibly be made to work with your mobile phone?
Additionally, the aforementioned page contains a number of modem scripts. As Simon Teale indicated, a PPP connection to the Internet can often be established. This provided that the phone company has enabled data services. In such a case, you could perhaps try the standard Ericsson Infrared script (and set the modem control panel to ignore the dialling tone) to begin with.
Jan