I lost WiFi after I upgraded to IOS 6 on my iPhone 4

URGENT ADVICE AND ASSISTANCE NEEDED
Hi all the experts out there. I have no problem upgrading to IOS 6 on my iPhone 4S, but when I did the same onto my iPhone 4, after re-start I just cannot connect to WiFi! I had no probelm with this connection PRIOR TO the upgrade. I called the Apple Call Centre, and the technician admitted that this is a problem. And he advised me to pushed both Power on and Home buttons together for 10 seconds and re-start the phone. I did that, but still the phone cannot connect to WiFi. I have restored to pre-IOS 6 on my iMac, but for some reason, the iOS 6 stays in the phone!
Please help!
Sang

A lot of us did. The way I fixed mine was to go into the WiFi settings and forget the network. After that, look for it again and sign in.
Other people were successful trying different things. If this doesn't work, then search the board. You'll find something.

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