How to fix the Wi-Fi on my Iphone 4?

I just downloaded the IOS 6.1.2 and I can't connect to any Wi-Fi at all. I have tried to turn my phone off then back on it still didn't work! Does anyone know how to fix it!

Settings - General - Reset - Reset Internet Settings. Don't know if it would work on yours. I had trouble with my Wi-Fi on iPhone 3. Googled it and found that and worked for me.

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