Do I need a Japanese Phone Number if I have T-Mobile One?

I have T-Mobile One (in the United States) and will be in Japan for an extended period of time. I was just wondering if I would have to get a new Japanese phone/plan for while I’m over there or if anyone else is using this plan while abroad?

by AaronJ2

6 comments
  1. I believe you can just add international to your phone line. Otherwise as long as you’re using iPhone you can use WiFi to send texts free/ what’s app for your calls and texts.

  2. If you’re a tourist, no. If you’re a resident you’ll likely need a Japanese number to register for basic amenities. Japanese websites, particularly, don’t like it when you try to enter anything out of the norm. But, that’s a more subjective answer that will depend on your individual circumstances than for every single instance.

  3. How long is extended? When I called T-Mobile, they said you can use the number for 90 days before they suspend the line.

  4. I used it in Japan (and Okinawa) for two months no problem. 5GB/month of data but calling costs money. I made a few calls and no issues with the service.

  5. This depends entirely on how many locals you expect to call you. Most folks use line, and you can activate with a US number. If you need people to voice call you on the regular, you should get a local number. They have cheap “050” VoIP numbers, but these can’t be used with most SMS authentication schemes.

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