TS1398 iPhone can't search for wireless networks.  Any suggestions?

My iphone 4S displays a message saying that it, "Can not search for wireless networks.  Any suggestions?  I've turned it off, reset the network settings, taken out the sim card, turned on/off airplane mode . . . what else can I do?  When I've phoned the help line I've been waiting to get through for over an hour!!

Try Resetting Network Settings from Settings > General Reset.
If that doesn't do it, this Apple doc might have something helpful -> iOS: Troubleshooting Wi-Fi networks and connections

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