1) In Facebook go to Settings > Click arrow on the top right
2) Now you will see a number of options on the right pane.
This will notify you if your device is logged into from an unusual device. It will send you a notification to Facebook on your mobile device.
Get notifications on your phone for logins from unknown devices.
Get security codes for access to your account using your mobile app.
Your Trusted Contacts
If you do not have access to your device you can have Facebook send codes to your trusted contacts who can then give you the information.
You can view the other security options available such as seeing what other places you are logged in to Facebook (e.g. websites that you have allowed to access your Facebook account.
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