Will my iPhone work in US while here from Okinawa, Japan?

I'm in the US for several weeks. My iPhone is not working. I have it subscribed to service in Okinawa Japan.

Should my iPhone be working properly to make calls and send MMS, and check email?

Is there something I need to do to make it work? Thank you.

Added (1). Thank you Tech One. But do I have to change carriers while I'm here? I'm still active with my current carrier from Japan.

If it is factory unlocked then I would surely work in any country with any carrier but it is a carrier locked then it will not work without that carrier. If it is factory unlocked and still not working in United States then try to change the carrier or contact for network support.
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Update:
Yes we advice you to change your carrier or contact your carrier about not working of iPhone in US.

Japan IPHONE's are locked so there's no way for you to get service while you are in the states.

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