Find 2nd iphone

There is also the "Find My" app on your Apple Watch, which should also show you the devices you have enabled to be found.

And there is the "Find My" app on the not lost iPhone, since you have 2 iPhones.

And you can always just call it, as you suggested, assuming it does not have the ringer silenced of course.

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 or iPad is lost or stolen - Apple Support and

Find your lost Apple device or AirTag with Find My - Apple Support