How to remove your phone number from Facebook (and prevent targeted ads)
The service has even been sharing numbers given for security purposes.
28 Sep 2018 ... If you use two-factor authentication (2FA) to secure your Facebook account, you ... since it requires you to enter a code sent via text message before logging in. ... Click Remove in the phone number field, which will prompt you to re-enter ... These cookies allow us to count visits and traffic sources so we can ...