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?
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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