(The latest iOS5 unlocking tool UltraSn0w1.2.4 is officially released! It supports iPhone 401.59.00, iPhone 3G/3GS04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00 baseband unlocking. The AT XAPP command is vulnerable, thanks @ sherif_ Hashim (@ Oranav also found this vulnerability). Until Apple fixes the AT XAPP vulnerability, all unlocks will still use this vulnerability.)