If your Windows phone is lost or stolen, Find my phone let's you ring, lock, erase, and track it. Just make sure everything's set up with a Microsoft account.
Find your phone:
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Go to account.microsoft.com/devices. If you're prompted to sign in, use the same Microsoft account you used to sign in to your phone.
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Select the Find my device tab, and then select your device from the list on the left. You should see a map showing your phone's location. Click the Find button to ensure this map is updated with the device's most recent known location.
Ring, lock, or erase your phone:
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Choose the phone you want to find, then select Find my phone.
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To make your phone ring, select Ring and follow the instructions.
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To lock your phone and show a message on the lock screen, select Lock and follow the instructions.
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To erase your phone, select Erase, then select the I'm ready to erase my phone check box, and then select Erase.
