Why my wifi can't turn on after update os 6

i have update ios from 5 to 6 in my iphone 4s, but after finish the update, i cant turn on my wifi.. any reason?

same here
tried
* restarting phone
* reseting network settings only
* tried turning airplane mode on/off..
can turn bluetooth on, just not wifi appears to be greyed out...
any updates would be handy....

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