Why Google is secretly linking your phone number to every account?

For over a year, Android devices have quietly initiated a process that automatically attaches the active SIM card’s phone number to every Google account signed in on the hardware. This includes primary, secondary, and even enterprise work accounts. While Google states this default verification enables features like device tracking, RCS messaging, and streamlined account recovery, they have not provided a transparent justification for why the phone number must be mapped globally across every dist