Can I jailbreak my iphone 3gs without computer?

My iphone 3gs have the latest update.

No. You need to download the programs on your computer in order to jailbreak.

Yes you can. Enter the url www. JailbreakMe.com in safari. Tap the free icon and it will turn into an install icon, tap install. This will install Cydia on your iPhone. Once installed run Cydia from your springboard.

No you need a computer to jailbreak it.

Yes you can like the previous answer jailbreakme.com will jailbreak your iPhone 3GS. But your iPhone has to meet certain requirements to jailbreaks such as if you have a supported iOS. Go to the website and it will immediately tell you if it's able to jailbreak it

Here you can get Tutorial - How To Unlock your iPhone, iPad or iPod

http://jailbreakbj.com/

This method its really work and its safe! Don't try others maybe will crash your phone