Google Play Services links phone number to every Google account on Android without a prompt

A Reddit user reports that Google Play Services automatically verifies the phone number on an Android device and attaches it to every Google account signed in on that phone, without a warning or consent prompt. The behavior also occurred on GrapheneOS, pointing to Play Services rather than a vendor ROM. Google has not publicly explained or confirmed the behavior.

• Verification happens without a warning or consent prompt
• The number is attached to every Google account on the device
• The issue also reproduced on GrapheneOS
• Users can disable verification per account in settings