Lock it down

 It sounds simple, but many of us don't do it -- make sure your mobile device is locked in some way to prevent physical compromise.

You can turn on your iPhone or iPad's Passcode feature to enter a four or six-digit passcode, as well as select the 'custom' option to set either a numeric or alphanumeric code. On iPhone X and later, go to Settings > Face ID & Passcode, while on earlier iPhone devices, go to Settings > Touch ID & Passcode. If TouchID is not a feature on your iPhone, the menu option will simply show Passcode.

On Android, you can choose to set a pattern, PIN number, or password with a minimum of four digits. You can choose by tapping Settings > Security & location/Security > Lock Screen.