How can I restart setting up my new phone

On your new iPhone, open Settings ➡️ General ➡️ Transfer or Reset iPhone ➡️ Erase All Contents and Settings ➡️ Continue: Once this action has been completed, then you will be signed out of Find My and your Apple ID. All information on your device will be deleted and your iPhone will be returned back to factory settings.

Axel F.

K8thomas0830 Said:

"How can I restart setting up a new phone"

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Restarting an iPhone Set Up:

A. Power Off your iPhone, and then try one more:

1. Turn iPhone On or Off - Apple Support
2. Set Up your iPhone or iPad - Apple Support

B. Restore from a Backup:

Have a backup? If so, restart the set up.

1. Turn iPhone On or Off - Apple Support
2. Use Quick Start to transfer Data to a New iPhone or iPad - Apple Support

No Success?

C. Set this Up Anew:

One other thought is to reset your iPhone, as if you were to sell it. Perform as instructed here, including the backup: What to do Before you Sell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support