Can I add my wife's phone to Find My iPhone?
To add a device to the list, you need to sign in with your Apple ID. After you've signed in on a device with your Apple ID, that device will appear in the list. Here's where you need to sign in: For iOS or iPadOS, sign in to iCloud, iMessage, FaceTime, iTunes and App Stores or Game Centre on the device.Nov 12, 2021
How do I add someone elses phone to Find My iPhone?
No. You can only use such features to possibly find your device if you are logged into your Google Account. It's not a stalker tool where having someone's phone number allows world tracking.Jun 3, 2020