Find my iPhone

Open the Find My app or go to iCloud.com and click Find iPhone. Select a device to view its location on a map. If the device is nearby, you can have it play a sound to help you or someone nearby find it. Mark As Lost.Mar 9, 2020

If your iPhone, iPad, or iPod touch is lost or stolen - Apple ...

You may --> Locate a lost or stolen device - Apple Support

Download and use Apple free Find My app using your Apple ID & password.