How to transfer my phone number to my new cellphone iPhone

Use eSIM Quick Transfer on iPhone

Some carriers support SIM transfers from your previous iPhone to your new iPhone without needing to contact them. You can also convert your current physical SIM card to an eSIM. 

If you don't have access to your current iPhone, contact your carrier to transfer your eSIM.

While you're setting up your iPhone, if you're asked to transfer your SIM, follow the onscreen instructions to transfer your physical SIM or eSIM. If you need to transfer more than one SIM to your new iPhone, transfer your additional SIMs following the steps below.