Setting your phone to vibrate is a good way to be alerted that someone is contacting you without disturbing others. But if you set your phone down on something large and hollow it can actually buzz louder than your ringtone would have. The best is when someone would set their phone down on a conference table at an important meeting. Everyone stops to look at that loud buzzing phone. You can pretend it’s not you when there’s a quiet ringtone chirping from your pocket.