This is the program you are referring to: https://www.apple.com/ipad/apple-sim/ https://www.apple.com/ipad/apple-sim/ AT&T will lock your physical SIM if you e

This is the program you are referring to: https://www.apple.com/ipad/apple-sim/ https://www.apple.com/ipad/apple-sim/ AT&T will lock your physical SIM if you ever use their service, but with anyone else you can jump from provider to provider on the same device at will.