Earlier i posted on how i managed to use my bb data plan on an iphone, but it was a bit vague and complicated. So, i have consolidated the process into a seven minute seven step guide (seven minute if you have an unlocked and jailbroken iphone already):
Tutorial: How to Get Your AT&T Data Plan Working On Your iPhone:
Step 1: unlock your iphone
Step 2: head over to “www.unlockit.co.nz”
Step Three click “Continue”
Step Four: Click “Custom APN”
Step Four: enter the following:
APN: wap.cingular
Username: wap@cingulargprs.com
Password: CINGULAR1
Step Five: click “create profile”
Step Six: Install the carrier profile
Step Seven: re-boot the phone
Step Eight: enjoy your data!
Additional Step: after a month check your bill to make sure not getting charged extra, in some cases people are reporting additional charges.
UPDATE: here is an updated video walkthrough…