Comment by superasn

A little trick that has made my life extremely simple is that I've set my ringtone to none. No vibration, no sound.

Then I've manually assigned ringtones to only 10 contacts who are really important to me.

So now my phone hardly ever disturbs or annoys me on anyone around me. Because the people without the ringtone can always wait.

P.s. also found a wonderful app called ringtone keeper that allows you to backup/restore this. It's discontinued now but I managed to save its apk.