How can I remove a second phone number from my new iPhone 13?

ok from this post, it seems you may have two phones numbers associated with your Apple ID.

You can go to settings > name > name, phone numbers, email > and edit the phone numbers listed there.

https://support.apple.com/en-us/HT207944

If you are referring to iMessage- you can go to settings > messages > send and receive > and remove the other number you don't want there.

https://support.apple.com/en-us/HT201287

hope this helps ;)

NickyP20 Said:

"How can I remove a second phone number from my new Iphone 13"

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Whom to Contact:

Contact your Carrier, as they are the one who provide you with the service of Cellular.