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Adding your phone number on Facebook isa completely safe option. It keeps your account secure and helps you connect with your friends and family. You can also access your account through the phone number in case of trouble sign in. Here’s how to add phone number to Facebook. Click on the bottom of your Facebook page. Go to privacy and settings, click on settings there. Under the account settings option click on personal information. Click on the contact info section. Click on add your phone number and enter the phone number you want to save. Click on continue and save it.