How to delete Wi-Fi history on iPhone 4S?

There's a way to delete Wi-Fi passwords and history. I just don't remember how. Does anyone know?

If you go into the Wi-Fi settings and select the Wi-Fi network you want to forget, you simply click "forget this network" to forget its password and you will have to re-enter it next time you want to sign in (you won't be automatically signed in next time).

If you want to clear the history of your browser, go into settings, click "safari" and click "clear history" and "clear cookies".

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