I got rid of my landline specifically because the only people who ever called it were telemarketers and robocalls. I don't get a lot on my cell phone, but I've given up answering any calls from people I don't recognize. If they leave a voice mail, I'll decide whether to call them back. If they leave no voicemail, I delete the number. Anyone I care about knows how to reach me. Anyone who doesn't know how to reach me, I don't care about.