Sorry, i should have mentioned that i did install that cab and it didnt help, i also enabled hspda, but it didnt help either. What did help, was that i went to ATT/cingular's website, added a data plan, which i did not have, but was able to use anyways previously, and rebooted. Now it works, so it looks like ATT was blocking my phone somehow after i changed the radio. I hope this helps someone else. if u have a data plan, try removing it and adding it back again or just call your provider.