Ask HN: How does FB know my phone number?
3 by dandare | 5 comments on Hacker News.
I have never shared my phone number with FB, not even for the 2FA purpose. I use a FB app on my Android phone, but it also never requested a permission to use my phone number. When I checked on FB before the leak there was no phone number in my account information. Yet my phone number, along with all my other credentials, is in the recent leak. What am I missing?