You can't but if you break you iPhone screen like I did, when you go to repair it they don't fix the screen they replace your iPhone and it will be jailbroken.
Us Jailbreak me on the iPhone 4 if you have the firmware 4.0
There isn't a jailbreak for the iphone 4 yet, but there will be in the near future.
You can not get Siri if you jailbreak a iphone 4. In order to get Siri you have to download the app.
To jailbreak an iPhone 4 you need to download redsn0w. For better info go to youtube and search ' how to jailbreak iPhone 4 on (whatever your OS is .example: IOS 5).'
go to **1 to know about jailbreak.
yes
You can jailbreak your phone by installing third party applications.
Yes, if you update it to iOS 5.1.1, there is an untethered jailbreak out.
You can jailbreak your phone by installing third party applications.
No as its illegal.
they are all the same
Illegal inmigrants