Wifi shows connected but doesn't work

My iPhone 4 shows that it is connected to my home network, but the wifi doesn't work. I know that the router is working because another computer on the network is working fine.

Try following:
Delete the WiFi network from your iPhone.
Disconnect the WiFi router from the power cord, let it be a few minutes, then reconnect.
Reset the iPhone by holding the Power button and the Home button at the same time, keep holding, ingnore everything on the screen, until you see the white Apple logo, then let go and let the iPhone restart. Set the WiFi t on and put in the password.
That should do it.

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