Can select but not use iPhone 4 WiFi in iOS 4.3.4 & 4.3.5

After I updated my iPhone 4 to iOS 4.3.4, I could select my WiFi-connection, but it would refuse to use it. The 3G or circle-icon showed instead of WiFi. In the settings, my home WiFi is slected, but it is not used. The 3G keeps showing instead. I tested it using YouTube and the browser and the speed is indeed 3G speed. I upgraded to 4.3.5: still the same problem.
I went to the settings, chose to ignore my WiFi network. I then re-scanned, chose my WiFi, just to refresh everything. It still didn't work. I restarted my phone, which also didn't solve the problem. Whenever I go to the settings, it shows the selection of my WiFi with the checkmark on the left as if I am actually using it, but it doesn't.

If you update to iOS 4.3.4 or iOS 4.3.5, you will need to power-off your WiFi-router, wait a couple of seconds and power it back on. Then, your WiFi-connection will work with the iPhone 4. If you don't do that, you will not be able to use WiFi on the iPhone 4.
Rebooting the iPhone or re-selecting the WiFi-router (even after deleting the connection) will not get the job done. Only by powering off/on your router. Now, it works again.

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