Quote:
Originally Posted by mineistaken
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).
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How hard is your phone number to say? The way they did it caused it viral faster. People just open whatsapp instead of text as it is cheaper/free. It uses your current contacts and everyone uses it so it is easy.