If I'm not expecting someone to ring my doorbell (or call me on the phone, which is certainly rarer), my phone is on silent. So I simply wouldn't notice unless

If I'm not expecting someone to ring my doorbell (or call me on the phone, which is certainly rarer), my phone is on silent. So I simply wouldn't notice unless I happen to be looking at my phone. I have my other communication (mostly FB Messenger, but also Discord and SMS/MMS) set up to work on my computer, so I rarely look at my phone at home. Also I live in a condo, nobody can really "knock on my door" unless it's someone who lives in my building, in which case I'll answer.