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I have upgraded to the latest official version available through Kies. And I have noticed that after the update the vibrator of the phone is not working. Actually its working but not in Silent mode on receiving a call. When we switch to vibrating mode or at the boot-up the phone, the vibrator vibrates. So the vibrator is functional.
I have searched a lot and I could not find any valid solutions.
Go to Settings -> Sound and make sure Silent mode is set to Vibrate, then in RINGTONE & NOTIFICATIONS section, check the option Vibrate on ring, then call yourself and it should vibrate.
