New iPhone 11pro do I need to use old SIM card from iPhone 7
New iPhone 11pro. Do I need to transfer old SIM card from iPhone 7
iPhone 11 Pro
Glad that answered your question. Your cellular carrier should have the information they need from your new iPhone to participate in its setup once you turn it on for the first time.
Enjoy your new iPhone! And don’t forget to clear out your iPhone 7 as follows before you let it out of your possession.
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support