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Louisville, KY
Single & Looking
3.1.3 has been jailbroken. It's basically the same as jailbreaking 3.1.2. Unlocking is a problem though an exploit has been re-discovered.
http://blog.iphone-dev.org/post/376648600/pre-game-show
"On Tuesday, Apple released firmware 3.1.3 for the iPhone and iPod touches. Unless you’ve personally observed a problem with the reporting of your battery percentage, there’s no reason to update to 3.1.3. We know some of you will want to anyway. Superbowl Sunday’s PwnageTool 3.1.5 for Mac OS X will let you do so safely, preserving your jailbreak and ultrasn0w unlock. (If you use the blacksn0w unlock (at baseband 05.11.07), you need to stay at 3.1.2.)"
"iPhone 3G and 3GS unlockers should always be very wary to update their firmware. This is no exception. If you make a mistake along the way you may find yourself updating to official 3.1.3 in which case you will lose your unlock, possibly forever."
Please read the entire page multiple times before doing anything and as always if you are unsure either do nothing or ask for help first.
Also there is this tool to upgrade if you are already jailbroke or pwned.
http://www.iphonehacks.com/2010/02/sn0wbreeze-14-released-to-jailbreak-and-unlock-iphone-os-313.html