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In Japan ID is required for voice service, but I think not for data only.

• ubercow13 7y ago
  You can't sign up for Signal with a data only SIM
  • PTcartelsLOL 7y ago
    Yes, you can. Data only SIM cards can receive SMS's. At least in Portugal they do.
    • ubercow13 7y ago
      Oh, interesting. I don’t think they can in Japan
• hiq 7y ago
  I can confirm that you don't need an ID for data only in Japan.