Redsn0w is a jailbreaking tool
Like BlackRa1n, Redsn0w is a cross-platform jailbreaking tool (for Apple iPhone). In addition it regulates immediately the installation of Cydia and the program for unlocking the SIM card. Redsn0w works from both an Apple OS and a Microsoft Windows OS.
[YouTube] K8w3ul_51zo [/youtube]