Jailbreaking what I'm I doing wrong?

How do you jailbreak a iPhone 4 without a computer I have tried all the web sites I could find but no dice can it be done? I know it's risky but need some different apps that Apple has to offer I seen the videos and tried all the steps and still nothing what I'm I doing wrong tried evasion and still nothing need help thank you

Don't jailbreak if you don't know what youre doing.

You CAN't
You Need A computer

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