All those who are holding back on iOS 5 update on their iPhones just because they rely on an ultrasn0w carrier unlock, it’s time to cheer up! MuscleNerd of Dev-Team has just tweeted that iOS 5 compatible ultrasn0w unlock is going to be released tomorrow. So if you preserve your current unlock-able baseband and update to iOS 5 using custom .IPSW creation feature in latest redsn0w 0.9.9.5b (download from here for Mac), then this will work just fine for you.

Here’s the tweet:

@MuscleNerd: will coordinate ultrasn0w iOS5 compatibility update to come out *after* a planned MobileSubstrate update tomorrow

UltraSn0w unlock currently supports the following basebands:

• 01.59.00
• 04.26.08
• 05.11.07
• 05.12.01
• 05.13.04
• 06.15.00