Act from a trusted device
Use another device you trust—or a private browser session on someone else’s device—to open the platform’s official find-device and account-security pages. Avoid search results or messages that claim to have found the device.
1. Try to locate and lock it
Use the built-in find-device feature to ring, locate, mark as lost or lock the device. Display only a safe contact method; do not reveal unnecessary personal information.
2. Protect important accounts
Sign out the missing device from primary email, cloud, password-manager and financial accounts. Change credentials when the device was unlocked, the screen lock was weak or suspicious activity appears.
3. Contact the carrier or administrator
For a phone, contact the mobile carrier through an official channel to protect the number and SIM. For a work or school device, notify the organization promptly because it may have remote-management or reporting procedures.
4. Consider remote erase
Erase is appropriate when recovery is unlikely or sensitive data is at risk, but it can stop location features from working. Understand the platform’s effect before using it.
5. Document the loss
Record the serial number, device identifiers, time, location and actions taken. A police or insurance report may be appropriate depending on the circumstances and local rules.
6. Watch for follow-up scams
Someone may send a fake “device found” message designed to steal the platform password or remove the activation lock. Use only the official device account.
Further reading
Google’s official guidance describes remote sign-out and device-protection steps in Lock or erase your lost phone or computer. Other platforms provide equivalent official tools.
Decide what the device could expose
Consider whether it was locked, whether storage was encrypted, which accounts remained signed in and whether authentication notifications could appear on the screen. A locked, encrypted device with remote controls presents a different risk from an unlocked device containing saved sessions and documents.
Replace trusted-device relationships
After regaining account control, remove the lost device from trusted lists, messaging sessions, password-manager devices and MFA prompts. Register the replacement carefully and verify that alerts reach the correct device. Keep monitoring for follow-up sign-in attempts or recovery changes.
Insurance and ownership records
Keep purchase information, serial numbers and device identifiers somewhere other than the device itself. These can help with insurance, carrier blocking, employer reporting or police documentation. Do not publish tracking screenshots or confront someone based only on an approximate location.
Prepare before loss
Enable find-device services, verify that remote lock works, keep backups current and know the account password without relying solely on the missing device. Review lock-screen notification settings and consider whether sensitive applications should require an additional unlock.