WiFi not Working on iOS 4.0.2 [Q]

I’ve got the iPhone 4 with ios 4.0.2 and ever since I got the phone I have not been able to connect to ANY wi-fi network. It will not pick up any wifi networks, it simply doesn’t work AT ALL. I tried doing all settings from the settings but it still doest improve anything. I tried to go through this
iPhone 4 forum , but nothing seems to solve my problem. What do I do ?
Thanks for your help !

Answer:
Try to reset network setting

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