Loss of wifi connect after 3.1.2 upgrade

I recently updated the software on my iphone, and now I am no longer able to connect to (or find) any wifi point.
I tried a restore of the iphone software, but I am still unable to connect via wifi at all. I am able to find the network on my mbp, and have even tried other reliable wifi locations, but not a single network shows up listed.
help?
Message was edited by: fndannyboy

Quick update:
after a few attempts to restore, erasing all data, and going through DFU mode, the wifi issue still was not fixed.
I did determine, however, that the problem did not occur until AFTER I downloaded the new AT&T carrier update--that took my wifi from 100% working to not being able to pick up my network.
I called tech support, and I have already sent the phone in for repair.
Let's see what happens now.

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