lost iphone

What have you tried as far as tracking?

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

Assuming that you have enabled Find My on the phone, it will not show up on a map unless it has good battery power and an Internet connection at its current location.

If the battery has run down or the phone does not have an Internet connection, it will not show up on the Find My map.

About all we can do is provide this article.

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

If you think it’s lost nearby, perhaps you can telephone its number.