I give Facebook my phone nummber and so far I've only known three purpose of this: log in, text me password when I forget (security) and find my friend by phone number when I install its app on my phone. Are there any other purposes of using my phone number by Facebook?
Facebook – What do Facebook do with phone numbers
Related Solutions
See if this page to securing your hacked account will work.
Otherwise try going to the page in question and clicking Report > This is my old account
You can use Google Authenticator as well. The "set up another way.." option from Security settings in Facebook generates a QR code which can be imported into Authenticator
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Best Answer
Here are some Facebook phone number usages:
I guess this is a nice feature for everyone. I mean if you are offline then you can still get updates from your account and friends. That's amazing.