How can I jailbreak my iPhone 4 on the phone without having to use a computer
First, you will have to download all iTunes and then create back up to your phone. Then use the software Semi Untethered. To download this software, go to http://cydiahelp.com/download-redsn0w-0.9.9b8-to-jailbreak-5.0.1-iphone-4-3gs-ipad-ipod-touch/. Browse the file from extras at and select Download here.