Your Android Phone May Be Linking Your Number to Every Google Account on It
Android phones are attaching the phone number from the SIM card to every signed-in Google account on the device, including work and secondary accounts. The SIM is the small chip that holds your number. Engadget reported this behaviour on 24 October 2026. The cause is a feature called automatic phone number verification, and it is switched on by default.
Google checks the number during device setup and adds it to every account on the phone, according to its support documentation. That documentation was changed between August and October 2025 to say verification is on by default. A Google Play services changelog dated 8 September 2025 lists phone number verification as running automatically at setup. So the default has been in place since September 2025.
Some users have received unexpected emails from noreply-phone-verification@google.com. The emails say their number has been verified. Google says verification supports features such as account recovery and RCS messaging, the newer system for chat-style texts. Signing in with a phone number, finding a lost device, emergency location services and Quick Share, Android's file-sharing feature, also depend on a verified number.
The linking reaches accounts added later too. A Google account added to the phone picks up every number already on it. Swapping SIM cards places the new number on every account. Google and carriers re-verify linked numbers from time to time, and that check can incur charges from your carrier. Turning on verification also enables Better sharing on Google for one of the signed-in accounts.
Google introduced Sign in with Mobile Number in October 2025 as an Android recovery tool. It finds the Google accounts linked to a phone number. It then lets you get back into an account using the lock-screen passcode of your previous device.
To stop the linking, open Settings, then Google, then All services, then Privacy & security, then Phone number verification. Turn off Verify phone numbers automatically. You can only change this on the phone itself. Turning it off does not remove numbers already attached to accounts. Those must be removed by hand, through Personal info, then Phone, in each account's Google settings.
Google's support pages describe the manual route. The pages "Sign in with your phone number instead of a username" and "Add your phone number - Android phone & tablet" cover adding or changing a number. For an account, the steps begin in the device Settings app, then username, then Your name, then Manage your Google Account. Google advises using a phone that can receive text messages. It says it sends a verification code to confirm a newly added recovery number.
The broader context here is a trade-off between easier account recovery and the spread of a personal identifier. One number on every account gives Google a steady way to help you recover an account and find a device. The same design means that a number on one account is present on all of them. It works a bit like a spare house key that opens every door in the building, and a SIM change reaches every account on the phone. For administrators of work profiles, and for anyone who keeps personal and secondary accounts apart, that spread is the detail to check.
In my view, the good news for careful users is that the default can be changed. The setting lives on the phone, not in a web console, and the removal has to be repeated for each account. Anyone managing several Android devices, or their own phone, should check the setting on each handset. Then they should look at the phone entries in each account's settings. Recovery tools that rely on a verified number are useful when a phone is lost or an account is locked. They work best when you know which number sits behind which account.
