If you got the new iPhone from Apple it will be unlocked, if not you need to make sure it is unlocked first.
Not sure about Canada but when we traveled from the US to Ireland we bought temporary sims there. Popped our US sims out, popped the Irish sims in and we instantly had service with the Irish carrier.
So barring any specific carrier shenanigans I would expect your existing service to “just work” in the new phone. Not being from Canada though I personally would wait for some locals to chime in.
If you got the new iPhone from Apple it will be unlocked, if not you need to make sure it is unlocked first.
Not sure about Canada but when we traveled from the US to Ireland we bought temporary sims there. Popped our US sims out, popped the Irish sims in and we instantly had service with the Irish carrier.
So barring any specific carrier shenanigans I would expect your existing service to “just work” in the new phone. Not being from Canada though I personally would wait for some locals to chime in.