41 Two step verification

You can set two step verification by turning  on login approvals

When a login is attempted from a different computer or phone or browser you haven’t used before Facebook will notify you and ask you to approve it with a security code. Facebook will sms the code to you or you can get it in your

Facebook app. 

"Once I  logged  from Singapore because I had not the local phone number roaming in Singapore."

You can set up trusted contacts for your friends to help you get back into your account if you ever lose your password.

Go to Security Settings , Tap Trusted Contacts. Tap Add Friends to get started.

Choose 3 to 5 good friends - friends you know you can easily contact by phone

If you can’t get into your account, Facebook will give your trusted contacts a security code that you can use to get back into your account. Only you can log in with the code - your friends can't.