We all know that Apple has released iOS 4.2.1 last night and we also told that after iOS 4.2.1 releases unlock for the basebands will be also be out. And those relying on unlock must not update to iOS 4.2.1.

Ultrasn0w unlock: After redsn0w is officially released with the new Cydia and kernel patches, we’ll be able to assess the unlock situation. It’s already looking very promising though, so expect unlock for the 3G and 3GS to be coming this week. The i4 unlock is taking more effort though, and no further concrete info is available about that yet.”

In short unlock will be available soon within this week for iPhone 3G and 3GS users. Ultrasn0w will be updated to work with these devices. IPhone 4 users will have to wait longer to use ultrasn0w unlock and use their devices with unofficial carriers.