2 Factor Authentication
iPad or iPhone, go to Settings, tap your name at the top of the screen, then tap Password & Security > Two-Factor Authentication.
Once you've set up 2FA, you'll get a notification on your trusted devices every time you sign in on a new device.
The alert includes a map which shows an approximate location, based on the IP address the device is currently using. Don't get too paranoid about this: when we sign on in Johannesburg you may get an alert indicating that the device is near Cape Town or Pretoria.