Lost stolen iPhone battery dead
How do you find the last none location of the iPhone you lost or was stolen using your new iPhone?
iPhone XS, iOS 13
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Sorry to hear that you have lost your iPhone.
To locate it in the Find My [Device] app, you must have activated the Find My app BEFORE the iPhone was lost. Here is some information on that app If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support.
Note that your lost iPhone must be able to make the connection to the internet via Wi-Fi or cellular connection so that it can mark its location and broadcast it.
Axel F.