Iphone
Why does my phone show a iPhone, iPhone 12 A’s my devices and I only have one phone? Am I logged in to my old phone still or could someone else be logged into my account as no well?
Question marked as
Did you remove your old iPhone from your iCloud account, after you stopped using it?
Remove a device from Find My iPhone on iCloud.com - Apple Support
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support