How to remove your phone number from Facebook (and prevent targeted ads)
The service has even been sharing numbers given for security purposes.
Sep 28, 2018 ... If you use two-factor authentication (2FA) to secure your Facebook account, you ... number from the Facebook app and it appears successful, you might want to ... is still there, as it was after I thought I had deleted it from my mobile. ... You may have also shared your phone number with Facebook to turn on ...