2. On performing step one above, a drop-down menu will appear. From the drop-down menu that appears, click log out at the bottom.
How to log out of Facebook without a Phone number
According to the Facebook Help Center, If you’ve lost your phone, you can log out of Facebook on a different device to prevent someone else from accessing your account. Here is how to log out of your mobile account if you don’t have your phone. To do that, follow this guideline;
1. You’ll need to log in to Facebook on a personal computer
2. Go to the top right corner of any Facebook page and click the small triangular shape icon to initiate a drop-down menu
3. Click settings from the drop-down menu
4. Click mobile at the left column of the new page that displays.
5. Under mobile settings, locate and click on the option that says; lost your phone?
6. Finally, click log out