Originally Posted by yakev724
If you need to unlock the phone, you first need to update the baseband to 6.15.00. Run redsnow, select your 4.3.1 firmware, then check 'install iPad baseband' when given the option. After it runs, your phone's baseband will be an unlockable 6.15.00. Install ultrasnow through Cydia (don't need to enter the repo like you did above, it's already entered for you) and it'll be unlocked.
Note that updating to 6.15.00 is permanent, you won't be able to simply hit 'restore' in iTunes and restore, and your GPS will stop working. But it is, as of now, the only way to unlock your phone.
thanks i'll give it a try tonight and let you know if it works.