Unlocked S21 Ultra on t-mobile, and latest beta. Put in a prepaid Verizon SIM. Connects fine to network (calls make phone ring, email arrives with WIFI off). The usual banner comes up about phone needs to restart with new SIM but no restart happens and the banner prevents the access of anything on the screen.
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A reboot with Verizon SIM only sets up Verizon user data on device. If network is configured properly and you are not interested in Verizon apps you can leave it as it is. Please do double check if you SMS/MMS work fine too along with your internet.
I submitted an error report just now. Re the issue, the phone is unusable as the message about the sim seems to javelin all focus. Unable to dismiss it nor access any app. So replaced the sim with the original
