How can I find another iPhone from this iPhone

There's Find My. This assumes that both iPhones belong to the same family group, or that the person who owns the other iPhone is willing to share their location with you.

iCloud+ - Find My - Apple

Find people and share your location with Find My - Apple Support

ashanti1993 wrote:

How can I find another iPhone from this iPhone

Easiest way is to log in and use iCloud Find My: https://www.icloud.com/find

And in general, here is what to do: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support