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Find My can help you locate and protect your missing Apple Watch. If you already set up Find My iPhone on your paired iPhone, it's automatically enabled on your Apple Watch and any Apple Watch paired using Family Setup. So if your watch is lost or stolen, you can use Find My to help you find it again. And thanks to Activation Lock, your Apple ID and password are required before anyone can erase your Apple Watch and use it with their iPhone.
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If your Apple Watch goes missing, you can immediately lock it from iCloud.com or your paired iPhone. Just place your watch in Lost Mode. Then you can send it a custom message with your phone number. So if someone finds your Apple Watch, they know how to contact you.
If you find your missing Apple Watch, tap Unlock on your watch, then enter your passcode. Lost Mode will automatically turn off, and you can start using your watch again as normal. You can also turn off Lost Mode from your paired iPhone or iCloud.com.
If you didn't turn on Find My before your Apple Watch was lost or stolen and your watch isn't connected to Wi-Fi, cellular, or your paired iPhone, you can't use it to locate your device. However, you can use these steps to help protect your information:
Find My is the only way that you can track or locate a lost or missing device. If Find My isn't enabled on your watch before it goes missing, there is no other Apple service that can find, track, or otherwise flag your device for you.