We have just received some exclusive screenshots showing iPhone 4 unlocked using Gevey SIM, on 2.10.04 baseband, running on T-Mobile US network.

The Gevey team has announced a new unlocking method for iPhone 4 users who are stuck on iOS 4.2.1, with 2.10.04 or 3.10.01 baseband.

As we all know by now, the exploit which iPhone Dev Team, including MuscleNerd and Sherif Hashim, thought would work to unlock iPhone 4 on 2.10.04, 3.10.01 and 4.10.01 basebands unfortunately turned out to be a no-show in the end.

Good news for iPhone 4 unlockers as we have yet another update, this time from none other than the man who actually works on the Ultrasn0w, MuscleNerd of iPhone Dev Team!

Its been a while since we last heard or read anything on the upcoming iPhone 4 unlock for 3.10.01 and 2.10.04 basebands. MuscleNerd of iPhone Dev-Team has already confirmed that unlock for iPhone 4 on newer basebands wont be released until Apple drops iOS 4.3 to public.

As we reported earlier, both PwnageTool 4.2 for Mac and Sn0wbreeze 2.2 for Windows are now available which can preserve baseband, and jailbreak iPhone, iPad and iPod touch on iOS 4.2.1 firmware.

The following instructions will help iPhone 4 unlockers to update to iOS 4.2.1 while keeping the old 1.59.00 baseband, jailbreak it untethered with GreenPois0n RC5, and then unlock it with Ultrasn0w.

If you have an iPhone 4 with the older and unlockable 01.59.00 baseband, and you want to upgrade to the latest iOS 4.2.1 while preserving your baseband, we have a solution for you. The following method will allow you to upgrade your iPhone 4 to iOS 4.2.1, while preserving the 01.59.00 baseband which is unlockable using Utrasn0w 1.2.

The following method will help you downgrade the baseband of iPhone 3G from 06.15.00 to 5.13.xx, which is unlockable using Ultrasn0w. This method will also enable you to restore your device on the official stock firmware using iTunes which was otherwise not possible on iPad’s 06.15.00 baseband.

The iPhone developer and hacker iH8sn0w has just teased a screenshot of Sn0wbreeze 2.2 with a new “Baseband Preservation Mode”. This new mode will enable current iPhone 4, 3GS and 3G users to preserve their baseband while upgrading to iOS 4.2.1 so that they can unlock using existing version of Ultrasn0w.

Earlier today, MuscleNerd confirmed that he has got a “backup” method of making jailbreak untethered on iOS 4.2.1. This new method utilizes iOS 4.2b3 (Beta 3) SHSH blobs which Cydia only recently started saving for all iOS devices.

Redsn0w 0.9.6b5 has just been released which can jailbreak and update iPhone 3GS & 3G baseband to 06.15.00 so that it can be unlocked using the newly released Ultrasn0w 1.2.