Google has implemented a system that automatically links a phone number to all Google accounts signed in on an Android device. This process occurs without explicit user consent for each individual account, meaning if a user has multiple Google profiles on one device and provides a phone number for one, that number may be associated with all of them.
The automatic linking happens when a phone number is used for verification or recovery on one Google account. Google's system then extends this association to other Google accounts present on the same Android device. This behavior was observed and reported by users who noticed their phone numbers appearing across accounts where they had not explicitly added them.
While the linking is automatic, users retain the ability to manually unlink their phone numbers from specific Google accounts through their account settings. The primary implication of this change is a potential increase in data linkage across user profiles, which could affect privacy expectations and how personal information is managed across Google services.
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Google is automatically linking phone numbers to all Google accounts signed in on an Android device, even if the number was only provided for one account. This change means a single phone number can become associated with multiple Google profiles without explicit user action for each account.