If you work in an office with other people, do you have your personal phone on silent or with sound on?
I have mine on silent, with vibration turned off but one of my colleague has theirs on and their keyboard sound on too and it drives me insane. Ping, click clickety click, swoosh (message being sent sound) then repeat all day long. 5 days a week.
For those who are going to ask, I have asked them if they can turn it down or off and was told no. We have no mobile policy so it's completely allowed.