Disaster Voice Messaging Service

NTT DOCOMO provides Disaster Voice Messaging Service to deliver safety status information as voice messages in the event of a large-scale disaster.
Disaster Voice Messaging Service is a disaster service for delivering voice messages by packet communications instead of voice communications when an overflow of voice communications makes it difficult to establish a connection in the event of an earthquake with a seismic intensity of 6-lower or greater or other major disaster occurring.
When you post a voice message, the party you want to hear the message is notified by SMS (Short Message Service). (If you use Disaster Kit, you will be notified by Disaster Kit when the other party receives the SMS.)
Furthermore, this service is available with Disaster Kit when you use a smartphone or tablet.

Messages can now be sent to and received from the phone numbers of other carriers' mobile phones (au, SoftBank, and Ymobile).

Service Overview

Conditions of service provision

When an earthquake with a seismic intensity of 6-lower or greater, or other major disaster occurs

Areas with service availability

  • Nationwide FOMA and Xi service areas
    • When you are overseas, only the receiving of voice messages (message playback) is possible.
  • Areas accessible via Wi-Fi (Internet).

Conditions of use

A FOMA or Xi subscriber (with a voice subscription) who is subscribed to one of the following services.

  • i-mode
  • sp-mode
  • mopera U

Usage charges and packet communications charges

  • Application: not required
  • Monthly charge: free
  • Packet communications charges: free*1
  • SMS communications charges: free
  1. Packet communications charges apply when sp-mode subscribers receive voice messages overseas and mopera U subscribers send/receive voice messages.

Sending Messages

  • Possible recording time per message: 30 seconds

Receiving Messages

Number of recordable messages

Up to 20 messages (If the number exceeds 20, messages will be overwritten from the oldest first.)*2

  1. Messages downloaded by the subscriber will be deleted from the server after downloading.

Message storage period

10 days (when the message is not retrieved)*3

  1. If the number of stored messages exceeds 20, messages will be overwritten from the oldest first even if the period is less than 10 days.

Notes

  • This service is only available during the service provision period. Please note that it is not available at other times.
  • For i-mode subscribers, both the sending and receiving of voice messages are available within Japan free of charge. When overseas, only the receiving of voice messages is available, and packet communications are free of charge.
  • For sp-mode subscribers, both the sending and receiving of voice messages are available within Japan free of charge. When overseas, only the receiving of voice messages is available, and packet communications charges apply.
  • For mopera U subscribers, packet communications charges apply for sending and receiving voice messages regardless of whether in Japan or overseas. When overseas, only the receiving of voice messages is available, and packet communications charges apply.
  • If the recipient of a voice message is using Caller ID Display Request Service, recording will not be possible if 184 is dialed when the message is sent.
  • If the recipient of a voice message is using Nuisance Call Blocking Service, recording will not be possible if the phone number of the sender of the message is registered for blocking.
  • Even if the recipient of a voice message has configured the SMS reject function, the notification will be received.
  • If the service will be used from a smartphone via Wi-Fi, version 10.0.0 or later of Disaster Kit is required.
  • If the sender of a voice message is using a billing plan with a limit function, the message can still be recorded after the limit amount is reached in the case of an i-mode or sp-mode subscription but not in the case of a mopera U subscription.
  • When a voice message is played, an SMS message notifying that the message was played is sent to the user who sent the message.
  • If the recipient of a voice message is using a billing plan with a limit function, the message can still be played after the limit amount is reached in the case of an i-mode or sp-mode subscription but not in the case of a mopera U subscription.
  • When a voice message is sent, an SMS message notifying that the message was sent is delivered to the user to whom the message is addressed.
  • If a user to whom a voice message is addressed could not receive the recording notification SMS message because, for example, the device was off or outside the service area, when a signal becomes available again, the device will receive any recording SMS messages within 10 days of acceptance.
  • When a voice message is played, an SMS message notifying that the message was played is delivered to the user who sent the message.
  • If a user who sent a voice message could not receive the playback notification SMS message because, for example, the device was off or outside the service area, when a signal becomes available again, the device will receive any playback SMS messages within 10 days of message playback.
  • During international roaming, only the receiving of voice messages is available.
  • A message may not be able to be recorded depending on the voice message recipient's subscription details and usage conditions.
  • A voice message may take a while to arrive or recording of a voice message may fail due to network congestion. If that happens, try recording the voice message again following the instructions displayed on the screen.
  • Even if the subscription has been suspended/cancelled or had its phone number changed, the stored voice message will not be deleted until the storage period of 10 days since the acceptance of the recording elapses.
  • Even if the subscription has been transferred or inherited, the stored voice message will not be deleted until the storage period of 10 days since the acceptance of the recording elapses.

  • Wi-Fi is a registered trademark of the Wi-Fi Alliance.
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