IPhone 3G upgraded to IOS 4.1, not able to search any WiFi routers

My iPhone 3G upgraded to IOS 4.1 and no longer able to search or connect to any WiFi access points, tried both reset Network settings and All settings but no help, any brothers encounter the same issues?
Just got some idea about what may happen to me.
Reports: iOS 4 upgrade kills old iPhones’ Wi-Fi (Yahoo News)
http://news.yahoo.com/s/ytechwguy/20100712/tc_ytech_wguy/ytech_wguytc3098

Same phone same os same problems. Over the past week my iPhone has been having trouble connecting to wifi. Have to join my home wi fi manually, everytime I want to go on Internet. Then it works for maybe a minute or two, then stops. Happening on other known networks too. Help

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