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You have to have a secure channel to exchange phone numbers too. The code could be communicated simply using a QR code. Other messengers already work this way a

You have to have a secure channel to exchange phone numbers too. The code could be communicated simply using a QR code. Other messengers already work this way and it works well.

couchand 7y ago
Yes, the difference being that a phone number is an established identity mechanism and you likely already know it.
- ubercow13 7y ago
  Yes but it's a kind of bad one. There are many ways you can lose or change your phone number. Email address is a better identifier.