Roaming is only avaible on the plus plan in Canada, Mexico, Puerto Rico and the US Virgin Islands. From my understanding if one sets up wi-fi calling before leaving the US it will work when on motel/hotel or public wi-fi. If it is shut off during you trip you will not be able to turn it back on again. I have read you can get just a data SIM for each location or country you are in and certain phones can use the data SIM to make and receive texts and phone calls. I don't know how that works or which phones other than the latest iPhones can do that.
If you have a Reddit account find the Visible page and post there, there are more knowledgeable people there than myself, I am just a tech noob.
