IOS 7 Unable to joint he network Wi-Fi problem?

Since I updated my iPhone 4 on iOS 7, I have problems with Wi-Fi. It simply doesn't want to join some Wi-Fi hotspots. Are there any solutions for this problem? Can i maybe fix it with DNS? I firgot to nention, currently i have iOS 7.0.3, so yeah, apple didn't fix it.

Go to settings, general, reset, and reset network settings. That should fix it.

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