iPhone 3.1.2 (7D11) Firmware 05.11.07 Jailbreak with BlackSn0w (blackra1n) by Geohot

For the official blog go here:
http://iphonejtag.blogspot.com/

To download BlackSn0w Go here:

blackra1n.com

Step by Step Guide with Pictures is here (includes all files needed at the bottom of the post):
http://4mobilez.blogspot.com/2009/11/unlock-iphone-312-firmware-with.html

Tutorial: Jailbreak iPhone 3Gs 3.1 and 3.1.2 With GeoHot BlackRa1n

Sebastien from iphonedownloadblog.com wrote a nice tutorial on how to jailbreak iPhone 3.1 by upgrading to 3.1.2 and then using Blackrain to jailbreak it. Here is the link:

http://www.iphonedownloadblog.com/2009/10/11/jailbreak-iphone-blackra1n-tutorial/

WARNING: This will NOT work for iPhones locked to a carrier. This will only Jailbreak your iPhone. It will NOT SIM unlock your iPhone.