I have update ios5.1 now wifi does not working and wifi hotspot does not displaying in setting

Dear All,
I have update ios5.1 last week on my iphone4 16GB. Now Wifi is not working and Wifi Hotspot not displaying in setting menu.
Pls help. What can i do now
Senthil

Can you tap the little "i" in the blue circle and "Forget this Network"

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