Samsung Galaxy S8 / S8+ - Vibrate Mode
Here's how to turn vibrate mode on or off for your Galaxy S8 / S8+.
- From a Home screen, swipe theStatus bardown to reveal the Quick Settings menu along the top.
- Tap one of the following sound icons until the Vibrate icon appears:
You can also activate Vibrate mode by pressing the 
Volume down button
(located on the upper-left edge) until the vibrate icon appears.