Vibrate Mode - The new Moto X™

  1. From a Home screen, tap Apps Apps icon (located at the bottom).
  2. Tap Settings Settings icon.
  3. From the Device section, tap Sound & notification Sound icon.
  4. From the Sound section, tap Phone ringtone.
  5. Tap None then tap OK.
  6. Ensure Also vibrate for calls is enabled Switch on.