I had a mess around with the internet connection feature on the GPRS modem software - it gives you the option to set up e.g. a connection using Vodafone (i.e. I am with Vodafone) GPRS. Haven’t set one up yet because then had a thought - remembered that Nokia have released a web server recently.

Its available from [1] mymobilesite.net and there are more details on their [2] wiki. I’ve just installed a copy - this screenshot below is what you can see when you open the application.

You can also view options through a browser, this screenshot below is an example of my site which have just set up.

I’ve had a very quick skim through the guide, you can send SMS to the mobile server (although at first glance they appear to go directly to a mailbox) and it says you can create mobile content using html and python, so I will do a followup post once I’ve had a chance to look into further.