Can't enable data connection after unlock
Did some searching on here and couldn't find the answer so hopefully someone can point me in the right direction.
I have an 8GB iPhone 3G at 3.1.2 and baseband 05.11.07. The phone was jailbroken with PwnageTool 3.1.4 and then unlocked with ultrasn0w 0.93.
After running the jailbreak, I couldn't get any service (I have an AT&T phone so I assumed it would) so I ran ultrasnow and my voice service came on just fine. The problem is that the data connection doesn't and I can't figure out why not. I've seen people with Tmobile unlock the phone and use their data plan so I think there must be something I'm missing.
I have an AT&T voice plan and have a 3G data plan but I *don't* have one of the special ones you have to pay 30 bucks a month for (the 3G phone I got didn't require you to get the smartphone specific bullshit plan). I know the 3G works because when I stick the sim into an HTC Touch Pro 2, I get the 3G no problem.
Can someone give me some advice on how to work around this? Thanks!
FOLLOW UP QUESTION: Would it be better if I did the unlocking with blacksn0w?