IPhone 4s ambinet sensor not working

Auto brightness is not working and the display light
Remains on during call even when i cover the sensor area.
What to do now?

Try a Reset...
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
If no joy... Then a Visit to your Local Apple Store or AASP, may be in order... Be sure to make an appointment first...

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