How can I find my other iPhone?

Use any internet browser and log into www.icloud.com/find

Also see the following Apple articles for information about lost or stolen iPhones or iPads: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support and

Use the Find My app to locate a missing device or item - Apple Support

If you had Find My turned on, log in to https://icloud.com/find with the Apple ID used on the iPhone.

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