iPhone 13 pro max e-sim
Cellular Plans from This
Carrier Cannot Be Added
Your device can only use cellular plans
from a different carrier.
this appeared when I was going to add cellular plan. Why ???
iPhone 13 Pro Max
Question marked as
Top-ranking reply
Your phone is locked to a carrier. You need ro contact that carrier and ask them to unlock it before you can use your phone with a different carrier.
How to unlock your iPhone for use with a different carrier - Apple Support