I have a cell phone only, have had no land line for probably close to 15 years, so I always can identify a number or a blocked call. I NEVER answer an 800 (or similar) #; I only respond if there's a voice mail that's appropriate for me. If someone I do not know and the number is not in the 800s, I always let that go to voice mail, too. Anyone who really needs me can/will leave a message.