Use Session Management from the Security Center to review available device information and end other sign-ins. This is especially useful after using a shared phone, losing a device or noticing activity you did not start.
Read the list carefully
The current device screen lists phones registered for account alerts, along with available app-version and last-seen information. That list is not a complete history of every browser or sign-in. An empty list does not prove that no other session exists, and a missing date should not be treated as a precise activity time.
Use the available logout controls
Logout other phones keeps your current session while requesting an end to other sessions. Logout of every phone includes the current device and asks you to confirm. Wait for the result, and make sure you know how to sign in again before choosing the broader option. The screen does not provide a separate revoke button for every listed phone.
If something looks wrong
Change your password from a trusted device, then use the logout controls. Removal can require affected devices to refresh their sessions; do not assume every already-open screen disappears immediately. Check Connected Apps separately for services you authorised.
Keep recovery ready
Read losing your phone and account recovery. For unexpected access that continues after these steps, use in-app support without sharing passwords or codes.
Choose the alerts you need with notification settings.