Find My iPhone
Why does Find My iPhone shows (3) devices under my name, all with the same phone number? Only one is active while the other two show "No Location found"
iPhone 8, iOS 14
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Yes, and they should be, unless they were lost or stolen. Log in to https://icloud.com/find and remove them from your account. If you accidentally remove your current phone, just go to Settings/[your name]/Find My and turn it back on.
Also, go to Settings/General/About, tap on the name of your current phone and rename it so you can distinguish it from the old phones.
If they WERE lost or stolen, leaving them on your account prevents them from ever being used.