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In Russia one cannot (in theory; actually it's possible sometimes). In Japan an ID is required as far as I know.

• inferiorhuman 7y ago
  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.