Lost or stolen iPhone. Not signed into iCloud or Find My. I have serial number and IMEI number.
My iPhone XS was lost or stolen. It was signed out of Find My and iCloud. I have IMEI and serial number. What can be done?
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If the phone was not signed into iCloud nor had the Find My app enabled on the phone before it went missing there isn't anything you can really do to get your phone back. Notify your cellular provider to see if they can add your phone to a Blacklist.
See this link for additional guidance --> If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support