Google automatically links phone numbers to all Android accounts since September 2025

Automatic Phone Number Linking on Android

Since September 2025, Android phones have automatically linked the device's SIM card phone number to every Google account signed in on that device. This includes primary, work, and secondary accounts. Google's support documentation confirms this process, stating that numbers are verified automatically during device setup.

Purpose and Implementation

Google indicates that this automatic number verification enables various features, such as account recovery and RCS messaging. While the company has not fully explained why the number must be attached to every account, the setting has been active by default for over a year. Google Play services changelogs from September 8, 2025, mention automatic number verification during setup.

Scope of Linked Numbers

The linking covers both existing and future accounts and phone numbers. If a new Google account is added to the device, it will automatically pick up all numbers present. Similarly, changing SIM cards will link the new number to every account on the phone. Google and carriers periodically re-verify these numbers, which can incur carrier charges, and the setting can only be managed directly from the phone.

Related Features and Implications

This verification also activates 'Better sharing on Google' for one of the signed-in accounts, supporting video calls, messages, and notifications. Other features dependent on a verified number include phone number sign-in, lost device location, emergency services, and Quick Share. In October 2025, Google introduced 'Sign in with Mobile Number,' an account recovery tool that uses linked phone numbers. Additionally, a 'Better ads & Google services' setting can use verified phone numbers for more relevant advertising across Google services.