When i open my camera eithrer for still or video, the camera is not working, its getting hanged,,,

Hello sathar2002,

Try this first:
Press and hold the Sleep/Wake (on top of the iphone) button for a few seconds until the red slider appears, then slide the slider. The phone will turn off. Then, push and hold it again, until the phone comes back on.

If that doesn't work, try this:
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. This will do a "hard reset" and should bring your iphone back to life!

Please let us know how this works for you.

Best regards,
Bill