Can you activate a new iPhone if it was bought in different country?

My service provider is a Canadian cellular provider. I was told by apple that I can get a free iPhone replacement for my canandian iPhone with an American one.
Apple told me that they are no different.

But when I went to go get my replacement. They put in the Canadian SIM card and it wouldn't activate bc I had a Canadian service provider… And automatically… Everyone knows that when you go down into the states… Your Canadian service provider (who ever your with) changes to an American service provider like AT&T or Verizon… And I couldn't get it:/ bc one, I had to be in Canada to "activate It" which I don't even know if it will activate or not. Lol two, I won't be back in Canada for awhile… So I'm stuck with my old iPhone.
My question is… Will it work? If I take that American iPhone to Canada will it work? And my service provider will be the same or what? So clueless! Lol

You can get your Canadian iPhone factory unlocked and you can use it in USA. Same thing goes for your iPhone bought in USA. Why would you even buy when your present iPhone can be unlocked and used in USA and Canada. If you need help with factory unlocking your iPhone, mail me for references.

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