"I'll be back."
Actually, no you won't. That's because I took a few minutes and installed nomorobo on my land-line. Don't know about you, but of late it seems as though robocallers and telemarketers have decided that the "Do Not Call" lists don't apply to them, and so an increasing number of calls have been coming into that line.
This free service seems to work pretty well: you add their phone number in as an automatic call-forwarding number on your land-line service. Robocalls and telemarketers are blocked, but your Mom is passed right on through.