How do I jailbreak my iPhone 4?

This article is only for the iPhone 4, nothing else.

How do I jailbreak my iPhone 4 on iOS 4.1?

How do I jailbreak my iPhone 4 on iOS 4.2.1?

How do I jailbreak my iPhone 4 on iOS 4.3.1 / 4.3.2 / 4.3.3?

How do I jailbreak my iPhone 4 on iOS 4.3.4 / 4.3.5?
last edit: 2011-07-19

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