I wonder how non-T-Mobile users will access the beta. Roaming requires cooperation from both the home and visited network since UMTS/3G (which introduced mutual

I wonder how non-T-Mobile users will access the beta. Roaming requires cooperation from both the home and visited network since UMTS/3G (which introduced mutual authentication; before that it was only the SIM authenticating itself to the network). Somehow I doubt that AT&T and Verizon will actively set up domestic roaming just for this beta. My suspicion is that T-Mobile will tie this into their "Network Pass" program, i.e. their eSIM based free trial solution.