Why am I being asked to add my mobile phone number to my account?
We may use your mobile phone number for purposes like:
Learn more about how Facebook uses your phone number or email address in our Data Policy. You may see a number suggested for you when we ask you to add your mobile phone number. It will only be added to your account if you choose to add it.

We may suggest a mobile number for you based on information we receive from sources such as:
  • Your mobile phone or tablet.
  • Contact info provided by others on Facebook.
  • A mobile number that you entered previously but didn't confirm.
Note: Once you confirm your phone number, you can adjust notification settings and control who can see your contact info. You can also remove a mobile phone number from your account at any time.
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