Wanted: modem driver for Sony Ericsson F251m for Windows ME

Hi,

I have a PC running Windows Millenium edition connected by a serial
cable to the RS232 port of a wall-mounted Sony Ericsson F251m, which
is how Telefonica connects me to the phone network here in Spain.

Setting up a modem, I found I only had the choice of several standard
modems and lots of ISDN modems. So I chose the fastest standard modem
which was "33600 bps standard modem". This works fine but limits me to
33600 and I suspect that compression is turned off.

Is there anywhere I can get hold of a "modem driver" more suited for
the model of mobile phone? The Sony Ericsson web site confuses me.

Thanks

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