As promised iPhone Dev Team has released software carrier unlock for iPhone 4 as an update for ultrasn0w to version 1.0-1, the update now allows users having iPhone 4 with baseband 01.59 and 3G/3GS basebands 04.26.08/05.11.07/05.12.01/05.13.04 enjoy services of any service provider on their contract locked devices.