Time for me to get a BT handset and go properly mobile - but O2's data rates are scary. £7 for 5Mb/month?

The best looks to be T-Mobile's Web'n'Walk, which is an unlimited web browsing add-on to their normal tariffs. A phone like the Nokia 6230i is ideal - no moving parts to break, long life, decent speed, chuck it in my bag and forget about it. And people on here seem to have no problems with the 6230i / 770 connection

Has anyone successfully got the Web'n'Walk service working with their 770? Or am I gonna have to commit and then tell you all how good it is? And are there any sensible alternatives?