My post very deliberately meant to disagree with that. Hanging up is mutually exclusive with leaving a message. Important to you is unfortunately not the same as important to the caller. A car mechanic or doctor's office might make very little effort to contact you another way, and might wait hours or a day before even attempting to do so. And we have delivery drivers known for giving up on delivering your stuff even in ideal circumstances.
My experience has been entirely positive. Every dentist, day care, plumber, doctor, car mechanic, etc whose call I was expecting has said a terse reason for calling like "Doctor So-and-so" or "X car mechanic your car is ready" or "day care please call". Of course I have no data for calls I wasn't expecting, but given that any call I am not expecting is usually a call to action to do business with them "hey, your car has X thousand miles, come for an oil change" or "your cleaning is coming up next week" or something like that.
Basically, if I am expecting the call, I 100% get them. If I am not expecting the call, I got a lot of them or they use another method like text or email. I am not aware of any calls I am not expecting that I missed out on, but my fear of missing out unsolicited calls is pretty low. And I trust that for unsolicited calls, they are more about getting through than I care about getting through.
