WiFi disabled after iOS 6 upgrade
After updating to iOS6, it is not possible to move the slider switch to the "ON" position to enable WiFi. Since WiFi is DISABLED, changing "join other networks", changing DHCP, changing DNS and clearing the Safari cache are not viable solutions to this problem. Rebooting the phone, doing a hard reset, etc. are not solving the problem either.
iPhone 4, iOS 5, iPhone 4S