How can I prevent syncing issues between two iPhones?
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[Re-Titled by Moderator]
Original Title: I bought a new phone, but any change that occurs in this phone occurs in the other phone.
iPhone 16 Pro Max, iOS 18
Question marked as
Use a different Apple Account. When using the same Apple Account across devices, the purpose is to share content where you can start an activity on one device and finish on another. You can find data being shared such as Messages, Call History, and Voicemails also. Review the information provided here for what you can expect for devices sharing the same Apple Account.
Make sure that each family member has a unique Apple Account - Apple Support