If you don’t know your phone number, contact Facebook Phone Number and what alternative information is available: Go to facebook.com/login/identify and follow the instructions. Make sure you use a computer or mobile phone to sign in to your Facebook account. Learn how to reset your password when you sign in again. However, for more information about Facebook, you need to visit our website. https://www.monktech.net/facebook-customer-support-phone-number.html