Jailbreak or downgrade without a computer?

I have no computer. Just an iPhone 4 or 5 (don't know which as it was a gift). I want to jailbreak it but since it has iOS 6.1.3 I can't. How do I downgrade to iOS 6.1.2 so I can jailbreak it. Keep in mind I do not have a computer.

Actually its not possible. You need minimum one PC & Internet connection.

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