My iPhone 4s connects to wifi networks, but internet own't work with password protected networks

Question

Hello,
I have an iPhone 4S.  I have been having issues with my wifi.  It works for several months, but one day for no reason I have been able to determine, the wifi stopped working.  It has been many weeks since it has worked.  I have tried several networks (home, work, relative's houses, etc...)
After visiting the Apple Genius Bar, I was told it was probably a software issue the wifi worked fine in the apple store on a unprotected network which showed that the wifi was able to function. It was recommended that I backup and then to a full reset to factory settings.
I did the backup and reset.  It has had no effect on my ability to use internet to secured networks.
I also updated the iOS to the most recent update ( 6.0.1) to see if that would help, but it didn't.
To summarize:
-iPhone connects to wifi networks
-Unable to use internet (or other data functions) while connected to a password protected wifi...but able to do so on unprotected networks.
-Already tried resetting network settings.
-Already tried resetting to factory settings.
-Already tried updating iOS.
Thanks

Answer 1

Might be a wifi router issue.  Try power cycling the router and/or updating it's firmware.  You might also try temporarily removing any security features until you get it sorted out.  If still an issue, it might be wifi on the iPhone itself... there have been many reports of wifi problems with iOS6.  Have you restored as new, i.e. without your backup?  You could also Google for ways to downgrade back to iOS5.
Regarding the Chipotle issue, go for the bowl instead of the burrito.