how do i get back my stolen device?
my iphone x was stolen after resetting it, how do i find it?
iPhone X, iOS 13
You need to have turned on Find My iPhone from this point on. See the steps in the first link below especially, but don't ignore the second.
If your iPhone, iPad, or iPod touch is lost or stolen https://support.apple.com/en-us/HT201472
Use Lost Mode in Find My iPhone on iCloud.com https://support.apple.com/guide/icloud/use-lost-mode-mmfc0f0165/icloud
If Find My iPhone is offline or not working https://support.apple.com/en-us/HT204233
