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I forgot the passphrase to a WiFi network but my phone still connects to it.

My old iPhone3 used to be connected there, then when I migrated to an iPhone4S the settings were magically transferred through iTunes. I guess the WPA2 key is therefore in the backups (which are not encrypted)

Is there a way to recover this WPA2 key from either the phone directly or from the backups? I read that there is an app for jailbroken phones but mine is not.

Thanks!

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Is this your WiFi network? If not, can't you just ask for the password again? –  Nathan Jul 17 '12 at 17:39
    
@Nathan: you mean to take the simple solution? :) In fact this is my WiFi network I installed at my parent's place on a tomato router. I have long forgotten all the credentials by now, including the router admin and the WPA key. The system is far away and if you have ever supported computer-impaired family you know that doing a remote reset of a router is something which one wants to avoid at all price :) –  WoJ Jul 18 '12 at 13:02
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1 Answer

If you don't mind jailbreaking your phone, there's an app called “Wi-Fi Passwords” in Cydia that displays the Wi-Fi networks you've connected to and their passwords.

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