How to use find my iPhone to find multiple devices?

I have more than one iPhone using the same iCloud account. I lost one iphone and want to know where it is but when I used find my iPhone it only showed one iPhone. How can I get it to show the other one?

Are you sure the iPhone in question was properly signed into Find My iPhone? If so, the app would show all devices signed in.

That or whoever found it may have signed out.

All the devices have to have find my iPhone ACTIVE on the phone and have a cellular or Wi-Fi data connection (also active).

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