Facebook

If you've turned on login approvals, you can get 10 login codes to use when you don't have your phone.

To get your codes:

1. Go to your Security Settings ( > Settings > Security)
2. Click on the Login Approvals section
3. Click Get codes
4. Enter your password and click Submit

You can use each code once. If you run out of codes or lose them, you can request new ones by clicking get new codes.