Regarding Whatsapp on iPhones?

I have a question. When you add a friend's phone number to your contacts and you both have whatsapp, does your friend get a notification from Whatsapp saying that you joined or are on Whatsapp? Let me know.

No
That didn't happen when I got whatsapp

No. If you have a contact with a number that's in the WhatsApp database you'd see them under Favorites. No notification.

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