Does new phone need a SIM card
Should I transfer the SIM card from old phone to new
Question marked as
Yes, if you want to use the same phone number, you can use the SIM card from your old iPhone.
That is just as useful, then you don't have to change 'anything', such as contacts, your trusted phone number, etc.
Then you also stay with the same carrier.
You can ask your carrier to convert the physical SIM card telephone number to an eSIM.