Sender ID Alpha numeric, numeric (For KDDI, overwritten to either Shortcode or Longcode)
Dialing code 81
Major Carriers KDDI, Softbank, NTT DOCOMO, Rakuten Mobile
Message length 160 characters
Support for Concatenated message Supported
Setup time -
Support for Two Way SMS Yes (Long Code and Short Code)
Country Regulations KDDI will prepend additional 2-3 numeric characters for International Numeric Sender ID
Country Restrictions

The following types of messaging on all SMS messaging products are all prohibited:

  • spam
  • adult
  • religious
  • political
  • gambling content

Industry Reference:

Japan Anti Spam Law

Information and Communication Policy Site

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