How to Access the List of ‘Known Devices’ on Facebook
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When you frequently use your mobile phone, tablet, and/or computer to sign-in to your Facebook account, Facebook starts treating them as ‘Known Devices’.
If you try to use a new device to log onto your Facebook account, Facebook prompts you to provide an answer to the security question or similar task in order to prove your identify. As soon as you authenticate yourself and prove your identity, the new device is also added to the ‘Known Devices’ list, and you can then use the device to sign-in to your Facebook account without any issues.
If you wish to view the list of the ‘Known Devices’ that are saved in your Facebook profile, you must go to your Facebook account settings either from your laptop/desktop computer, or your Android smartphone.
Here is how: