Got a new phone and it linked my sister contacts
I had lost my phone and I linked my Apple ID to her iPad and it transferred her contact to my phone
iPhone 11 Pro Max, iOS 15
I had lost my phone and I linked my Apple ID to her iPad and it transferred her contact to my phone
iPhone 11 Pro Max, iOS 15
Signing into the iPad synced her contacts to your Apple ID, so when you signed into the new phone they were transferred to the new phone. If you don't want to keep them, you need to manually delete her contacts.
Got a new phone and it linked my sister contacts