It’s quite possible that all that is really happening is they are overlaying the sending number with the sent to number. I know that telemarketers can now call you and have caller ID replicate the area code and first three digits of your phone number. In fact, it’s how I know it’s telemarketers. If the number is local, but I’ve not assigned a person to it already, it’s always either a telemarketer or a wrong number. If it IS someone I know, they’ll leave a message.
I don’t answer the home phone. If someone really wants to talk to me, they can leave a message. Doing that has made life easier these days.
Only a handful of people know the cell number and it’s an old flip phone so no apps on it. On the rare occasion there’s an unknown number calling, I simply don’t answer it. It isn’t even turned on 98% of the time. Again, life is easier. Knock on wood.