I love the iOS everything is awesome but man where is the apn.. Son of a bitch!!!
Edit: less than a minute I remember the old school iPhone 2g unlockit.co.nz did the job again!
It should be isp.cingular or whatever your apn before. User and pass is blank.
On the dropdown list choose US-AT&T
Mine is perfectly working
Mine actually works (AT&T) but I can't log in, view usage, bump up my plan, etc. I'm sure it'll get fixed in another beta release. I'm on wifi both work and home, so my 3G is switched off unless I need it.