Transfer eSIM from old iPhone to new iPhone

When you get your new iPhone and if your carrier supports it, on your new iPhone, go to Settings > Cellular, tap Set Up Cellular or Add eSIM, then tap Transfer From Nearby iPhone or choose a phone number. On your previous iPhone, follow the instructions to confirm the transfer.

click here ➜ Set up cellular service on iPhone - Apple Support

If you use QuickStart to set up your new iPhone, the setup process will ask you if you want to move your phone number over to the new iPhone as part of the process. It's very simple.

Contact your cell carrier. They can tell you their procedure for moving to a new phone.

Regards.