trying to add new phone number to account, it is saying this number is in use. It is anew phone number
Trying to set up my new apple ID. Got a new phone with new phone number. When entering it says this number is already in use
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The phone number is almost certainly in use as a trusted number by another Apple ID as the error message describes. Phone numbers are recycled by carriers because there is a finite supply. You could potentially contact Apple Support to see if there are any steps you could take to move forward, but you will likely need to request a new phone number from your carrier. It is an unfortunate situation, but one not easily resolved due to Apple's strict security and privacy policies.
Contact - Official Apple Support