Signing up with phone number doesn't work for lots of young people I suspect. We don't have phone numbers of friends anymore, for example I have no phone numbers of even my closest friends, we have been communicating via internet since we have been teenagers (started with ICQ, then moved to emails then FB then whatsapp, never really needed to share our phone numbers as we don't ever call anybody nor send SMS).
This might be just specific to very international people like me who travel and work in many different countries so our phone numbers change often and keeping track of that is almost impossible.
This might be just specific to very international people like me who travel and work in many different countries so our phone numbers change often and keeping track of that is almost impossible.