What will happen if I change an apple id?

Me and my dad have had iPhones for months and he has been using my Apple ID on his phone. He's getting a new phone soon so I want him to use the separate Apple ID he has on his iPad so the only question I have is if he changes his Apple ID on his phone to the one he's using on his iPad will his contacts and pictures on his phone get deleted? If he goes to back up his phone now I don't want any of my pictures music apps to get transferred to his phone. He doesn't have any apps or music on his phone so the only thing that needs to be still there are his contacts and pictures. If you have any advice on how I could fix this or what I should to please help.

If he changes his Apple ID, then the pictures and contacts won't be deleted for sure. That is staying with the phone that he currently using. So don't worry about it. As for the apps and music, that won't be moving on with his phone though if he chooses to use a different Apple ID. Hope this helped.

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