There is a solution to this problem.<p>1. Change the phone number system to require 207 digit phone numbers instead of the current 10 digits.<p>2. Assign random phone numbers to everybody.<p>Now the only people who can call you are the people who know you. You have to actively share your number with people. If people call random numbers they will get &quot;not in service&quot; messages all day long.<p>We have 20 years of experience with NEW communication systems with NEW addressing systems where people can&#x27;t connect without knowing your email address or IM handle. It can be done, i.e. it is workable to require people to share contact info before you can communicate. People will find a way.