Iphone 6.1.3 IOS Jailbreak/unlock?

For free, and aside from contacting AT&T, how can i unlock/jailbreak my iphone 3GS, with IOS 6.1.3.

Http://www.unlockboot.com/2013/03/iphone-5-4s-and-4-unlock-for-ios-613.html

http://www.limera1n.cc/2013/03/how-to-unlock-iphone-54s43gs-on-ios-613.html

HOPE THIS HELPED

Simply follow the step so you can jailbreak your iPhone 6.1.3 IOS Jailbreak/unlock

http://iphonejailbreak-unlock.com

You can check the Jailbreak and unlock process here at http://jailbreakhome.com/iphone-factory-unlock.
No software needed to do the iPhone Factory Unlock.