TL;DR Google now automatically verifies and attaches your phone number to every Google account signed in on your Android device without explicit prompts.
Google updated its documentation between August and October 2025 to reflect this opt-out behavior, which links numbers across secondary, work, and alt profiles.
Users can turn off “Verify phone numbers automatically” in their Android device’s Google settings page, but previously linked numbers must be manually removed from each Google account’s Personal Info page.
Your Android phone is deeply integrated with a number of Google services, but a quiet background mechanism is currently causing a stir among users. A growing number of Android users are only now learning that Google automatically verifies and associates their phone number with every Google account logged into their device, without any explicit confirmation prompt.
As spotted in a recent Reddit thread, users report receiving confirmation emails out of the blue from “noreply-phone-verification@google.com” stating that their phone number has been verified. The feature, known in Google settings as “Phone number verification,” links your active phone number across all Google accounts signed in on the same phone, including secondary profiles, work accounts, and throwaway handles.
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