HT204053 Old Apple ID used with new iPhone OS, how to sync and use new Apple ID?

My iCloud account on my iPhone is my old Apple ID. My MacBookPro and iTunes are with the new Apple ID. I updated my iPhone with the new operating system and my iCloud account was with my old Apple ID and wouldn't accept the Apple ID or password so I had to skip the step where it synced my FaceTime, iMessage and iCloud. How can I change my Apple ID on my phone so it reflects my Apple ID on all my other devices?

Welcome to the Apple Community.
In order to change your Apple ID or password for your iCloud account on your iOS device, you need to delete the account from your iOS device first, then add it back using your updated details. (Settings > iCloud, scroll down and hit "Delete Account")

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