How you jailbreak an iPhone 4?

I have iOS 6.1.3 oh yea it has to be free.

Go to youtube and tap "how to jailbrek your iPhone 4 6.1.3 and watch a video it's simple

It's really simple! Use the link below as instructions! I really recommend to use the video.

The best method I used is sn0wbreeze you can give it a try and it is definitely free.

Here is a tutorial with pictures
http://computersight.com/computers/tethered-jailbreak-for-ios-6-1-3-with-pictures-read-desc-first/