Hacker News new | ask | show | jobs
by flyt 3686 days ago
It doesn't send any personal data back to WhatsApp/Facebook, all it needs to work is a phone number.
1 comments

Except… WhatsApp definitely gets a copy of your address book: https://www.whatsapp.com/faq/en/general/20971813 “During this entire process, only phone numbers are sent to WhatsApp for lookup, securely, over an encrypted connection.”
Whatsapp also gets the metadata about the message: sender, receiver, time and probably location.