The backdrop:

• The reflex of always answering the phone, something that was so ingrained into people who grew up in the 20th century, is now gone. Madrigal writes: "In the moment when a phone rang, there was an imperative. One had to pick up the phone. This thinking permeated the culture from adults to children."
• In the telephone's infancy, there were no voice mails, no caller ID, and not even a *69 feature to use to dial the last person who rang. Not too long ago, avoiding a call could mean missing something important — at least until the person called back.
• But as communication options became more abundant, the need to answer every call has dissipated. Madrigal writes: "Texting is fun, lightly asynchronous, and possible to do with many people simultaneously. It’s almost as immediate as a phone call, but not quite ... So many little dings have begun to make the rings obsolete."

The spam

Spam phone calls have also led more and more people to avoid answering the phone. As years have gone by, robocalls from unknown numbers have become far more frequent.

• Telemarketers were the spam calls in the 20th century, but they have since been replaced by automation and bots who don't take days off.
• The FCC has been trying to block robocalls, but there were more than 3.4 billion placed in April 2018 — more than ever before.
• In modern times, answering a call from an unknown number becomes a guessing game, and sometimes people don't bother guessing at all.

Go deeper:

• What you need to know about that big study on cell phones and cancer
• Study confirms we all use our phones while driving