You can turn on the vibration mode in the Karbonn K140 by simply pressing the hash(#) button on the lower right side of the keypad of your phone. If the same is set to mute, you can change the setting by going into the settings icon and turning on the vibration in the silent mode. The phone gets a 1000 mAh battery and comes with a 2.4 inch screen. the camera is 0.3 MP and you can even add up some memory via microSD card(up to 8GB).