I've got a 1st gen iPhone 8GB on 2.0, pwned, and I'm on an O2 pay monthly contract. They've offered me a free internet bolt on but I don't want to take it until I know I can get EDGE & GPRS working.

I looked here and put the settings in (under general > network > cellular data network) but this did not work.

Does anyone know how I can get EDGE & GPRS working on my handset? Thanks.