Thanks to archive.org:
Quote:GeoISP
Internet access via dial-up on a geographic number: 020 8114 9845
Use any username and password to log in
Calls billed at 0p/min by 18185, 1899
Calls usually included in bundles offering free nationwide calls
Calls usually part of inclusive minutes for mobile users - cheaper than GPRS!
No catch, no subscription, no need even to register
Checked just now, the phone number still answers with modem tones - not got a modem hooked up to check it at the moment though, but it looks like it's just the website that is down.