IPhone 3GS cannot access wi-fi since 6.0 upgrade

I have an iPhone 3gs and since upgrading to IOS 6 I cannot get access to wi-fi either at home or on campus.  I tried Reset Network Settings and that didn't help.  Does anyone have any other suggestions?

Slight correction - The phone can recognize the router if we are within 5 feet of the router at home.  Nothing on campus.  Before the upgrade the college wi-fi was recognized all over campus.

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