Here is a sad news for all those who are waiting for Ultrasn0w to unlock iPhone 4 on iOS 4.2.1. MusclieNerd has just informed all unlockers through his twitter account that the next unlock will be released after iOS 4.3 or iOS 4.2.5 is out.
Apple has already released iOS 4.3 beta for developers only and we have also seen an iOS 4.2.5 version installed on CDMA iPhone 4. So it is little confusing right now that iOS 4.3 will be made public for all idevices including iPhone 4 GSM and CDMA version or iOS 4.3 is only for GSM iDevices and iPods and iOS 4.2.5 is for iPhone 4 CDMA.
MuscleNerd: Official iPhone unlock statement: no unlock will be released until after 4.2.5 or official 4.3 (whichever is last) is out
So all those who have iPhone 4 with Baseband 3.10.01 and 02.10.04 will have to wait about a month more for Ultrasn0w unlock.
However iPhone 3GS and iPhone 3G users who are on baseband 05.15.04 can unlock their idevices on iOS 4.2.1 by upgrading the baseband to iPad’s baseband 06.15.00.