So would that enable you to call into a freephone or low rate ISP dial up service from your mobile then, ExGrunt?
That's what Orange told me couldn't be done. If it can though, are you billed as per a conventional call (obviously mobile rates to freephone/low call numbers differ from those for landlines but that aside) or do you pay a different tarrif for a 'data' call? It seems to me they must be able to telll the difference between the two types of call or you wouldn't need the network to enable the function.
I do remember making a dial up data call years ago via a mobile and the phone displaying a 'D' icon as I did so, but that was on a mobile phone which had an analogue modem in it. Don't most current mobiles only have GPRS modems?
It's a bit of a minefield this area when it comes to finding the best value it seems.