- 2.2.1 does not break the dev team's methods of jailbreak.
- 2.2.1 breaks the 3g software unlock
- 2.2.1 does not break iPhone 2G unlock since the 2G baseband is not updated.
(it hasn't been updated for 8 months)
Don't Upgrade yet though . . .
For anyone that wants/needs to unlock the iPhone 3g do not update to 2.2.1 until the dev team releases a method (i.e. PwnageTool) for a 2.2.1 jailbreak/upgrade. If you upgrade to 2.2.1 your baseband will be upgraded and it is unclear if/when you will be able to unlock.
Also, check out MuscleNerd's video "2.2.1 and you"