O2 unmetered Internet access via WAP dial-up works.
I see a bunch of people want to use the full internet through their o2 pre pay phones. I havent heard anyone mention that you can get the full internet through the WAP Dial-up account.
Though its only 9.6kbps :(
Use the dial-up WAP and enjoy slow internet with Opera, IM programs and POP3 mail all unmetered.
Hope this helps.
Feel free to flame my ass if this has been posted to hell (I did search, honest I did).