I would like to know about the disaster message board service.

Please check in advance as usage methods differ for each carrier, NTT for landlines, docomo, au, SoftBank, WILLCOM, and Y!mobile for mobile phones.
(1) NTT Disaster Emergency Message Dial "171" (voice)
You can register and check safety information by dialing 171. You can also use it from your mobile phone.
(2) Mobile phone disaster message board
You can register and check messages at NTT Docomo, au, Softbank, public telephones, etc. Reciprocal linking of message boards has been set up between carriers. Please contact each company for details.
(3) Experience service
1st and 15th of every month, the first three days of the New Year (January 1st to January 3rd), Disaster Prevention and Volunteer Week (January 15th to January 21st) and Disaster Prevention Week (August 30th to September 5th) In addition, you can experience the NTT disaster emergency message dial "171" and some mobile phone disaster message boards.