How to find my lost iphone

These are the only steps you can perform:--> If your iPhone, iPad, or iPod touch is lost or stolen, and/or:--> Use the Find My app to locate a missing device or item - Apple Support

Regards and best of luck.

Giulio

Start looking for it by logging in with your Apple ID here:

https://www.icloud.com/find

If your iPhone is completely lost or stolen, see the guidelines for it here:

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