Quote:
Originally Posted by Mickey_
Added step=slower adoption rate, less convenient, less familiar. The method of using the phone number as the ID means you won't even have to tell me your "ID", if i already have your phone number saved in my contacts i can message you right away.
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You have to tell your ID (in this case this equals your phone number) to new people.
As for the current contacts from your phonebook - no extra step as you could still message the same way (remember your ID would be associated with your phone number anyways, so app would still find contacts based on the phone numbers you have in your phonebook).