Will a straight talk iPhone work in Japan with a Japanese sim card?

I'm pretty sure you can put a sim card in it but I was curious I want to go to Japan sometime but it is difficult getting a phone there being a foreigner and it is pretty expensive but I see people switch their sim cards with there phones a lot like with at&t ect. I wonder if that would work the same overseas? Like putting a japanese cell service provider's sim card in the phone? This probably sounds really stupid though but thank you!

You'll be able to do that.

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