IPhone 4 says unable to join network when connecting to Wi-Fi?

I have an iphone 4 and just got home and tried to connect to Wi-Fi and it says "unable to join network" but it works fine with everything else I have connected

Try a landline of some sort or reset your phone or click the home button and the power button down at once for about 10 seconds, that resets but doesn't delete

Try resetting your router. Mine had the same problem and that worked for me.

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