Today a post revealed that Facebook is using phone numbers customers have given as a security action for two-factor verification as a way to send targeted ads to those users - How To Remove Phone Number From Facebook.
If that's not a thing you intend to take place (as well as you shouldn't), you can navigate the problem by removing your contact number from the site and setting two-factor authentication up using a verification app instead.
How To Remove Phone Number From Facebook
To remove your contact number from Facebook go to the Settings menu on your account (you get there by clicking the arrowhead at the top right side of the page) and afterwards Your Facebook Info adhered to by Sight under the Gain access to Your Info tag. Within that menu, you'll intend to select Personal Info and after that Your Contact Information. When you see your contact number, hit that delete button.
To Remove a mobile phone number:
-Click in the top right edge of your Facebook page.
-Click Settings, after that click Mobile in the left sidebar.
-Click Remove below the number you 'd like to Remove.
-Click Remove Phone to verify.
Later, select Protection and Login from that main Settings page and afterwards Set up two-factor verification. From there you must be able to personalize your two-factor Settings, particularly to make sure that you're making use of an authenticator app (such as Google Verification) as opposed to your contact number for that additional layer of safety.