My contacts keep changing into my parent's contacts?

I'm using my Dad's old iPhone 4, so it has all of his data. I cleared out everything that was his but I hate the part where each time my parent's add a new contact to their phone, everything syncs over to my contacts, so I'm scrolling down my list and see a new person I don't know but my parents do. Is there a way to change this?

Call the manufacturer

The best solution is to go to an actual company owned store for the provider (most likely AT&T) and have them check the settings on your family plan. Your father's current phone is setup to do automatic data backups, and the provider has your iPhone 4 still linked as part of that backup… And you are receiving automatic data syncs. Chances are your father is receiving your contacts as well.

Why I recommend visiting the provider store is that they can view settings on the plan and view phones on the account. Your father may have do this, or at least be able to authorize them to dig into the plan and contract if he is the account holder. If he is getting your contacts - I bet he'll be glad to want things fixed too!

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