After the JailbreakMe tool was released last day to be the first tool to jailbreak the iPhone 4,Ultrasn0w 1.0-1 now the release of the Ultrasn0w 1.0-1 is also nearby as a leaked screenshot of it proves this fact. Ultrasn0w 1.0-1 is expected to be released within 24 hours from now.

Ultrasn0w1.0-1

Ultrasn0w 1.0-1 could unlock the iPhone 4 on baseband 0.1.59.00 and also on the iPhone 3G and 3GS with basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04. You could use this guide to jailbreak the iPhone 4/3GS/3G using JailbreakMe.