lost my iPhone and Find My iPhone is not working because my lost iPhone does not show up as a device on the list
what to do
iPhone X, iOS 15
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See the information in If Find My iPhone or Find My iPad isn't enabled on your missing device - Apple Support including the following:
If your missing device doesn't appear in the Find My app or at iCloud.com/find, you didn't turn on Find My. There's no other Apple service that can find, track, or flag your device for you. But there are steps that you can take to help protect your data.