Our users have written 1 comments and reviews about redsn0w, and it has gotten 24 likes
Redsn0w is the one that does it all- it jailbreaks, unlocks, hacktivates, sets up custom boot logos, and even lets you activate certain iOS4 features on models that don't support them. And it doesn't require a full restore of your iPhone to do it.
The problem is, redsn0w cuts off support at the iPhone 3G. It doesn't work with any iOS device released after 2008. But if you have an older model, I would highly recommend using this.