The Android operating system, currently installed on billions of devices across the globe, is receiving some significant security enhancements.

Several years ago, Android introduced Factory Reset Protection, a security feature that prevents an unauthorized person from accessing your phone by requiring a Google login or PIN after a factory reset. If someone fails these logins, they can't complete setup (meaning they then can't sell your phone).

This new Google Android update stops smartphone users from doing three things — here’s what they are and why it matters.