Kd they say “not i4” is to talk about the iPhone 4 not iOS 4.0 NOT TO BE CONFUSED !!!!
Ultrasn0W 0.93 available via repository repo666.ultrasn0w.com (now become .org) unlocks all iPhone basebands from FW 3.0 to 4.0 !!
According to an iPhone blog whose name I would not mention:
“This new version of Ultrasn0w allows you to unlock all iPhone basebands from firmware 3.0 to that of iOS 4 (version 05.13.04)” -> So don’t panic you can unlock all iDevices with EXCEPT l ‘iPhone 4;)