Switching to a Japanese Phone

Every website I visited makes it seem like I have to buy a whole new phone in addition to a phone plan from one of the top three Japanese phone companies.

What if I want to use the current phone I have, but just buy a new sim-card, phone number, and a plan? Is this possible? Must I buy an entire new device?

EDIT: My phone is an unlocked, iPhone 8 Plus

Hi Makotaco, welcome on board.

It seems that you can use your phone if it's unlocked and just buy a sim : Phones in Japan

Hopefully members will provide you more details.

All the best,

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