It pretty much works with other carriers. My spouse has Verizon prepaid, and when they get a new phone, just pop the sim out of the old phone and put it in the new one. Same thing with t-mobile US prepaid for me. Around the world it's even more common to just move sims around.
Especially around the turn down of 3g, some US carriers were picky about the phone you used (must support VoLTE on their network or not allowed on a phone plan), but to my knowledge they wouldn't ban your sim, maybe just the phone after some notifications.
Especially around the turn down of 3g, some US carriers were picky about the phone you used (must support VoLTE on their network or not allowed on a phone plan), but to my knowledge they wouldn't ban your sim, maybe just the phone after some notifications.