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A large-scale communication failure occurred at KDDI, one of Japan's three major mobile carriers, and the provision of services such as mobile phone calls and data communication was not smooth for over a day.

According to KDDI on the 3rd, it has been difficult to use KDDI's communication service since 1:35 am the previous day.

au and UQ mobile phones, low-cost plan brand povo, voice communication for operators using au lines, Internet phone, text message (SMS) service, and voice communication (VoLTE) service using long term evolution (LTE, 4th generation mobile communication) network The situation in which it is difficult to use KDDI's major telecommunication services, such as such, continues for more than ten thousand days throughout the Japanese archipelago until the morning of the 3rd.

Emergency calls could not be used, so KDDI recommended using public phones.

Asahi Shimbun reported that KDDI's service contracts amounted to about 62 million, including 31 million for individuals.

In addition to consumers who directly use KDDI's services, those who use Rakuten Mobile, a low-cost mobile communication brand using KDDI's lines, also experienced inconvenience.

Postal company Nippon Yubin has announced that there is a risk of delays in the delivery of mail and parcels due to a problem with the cargo information system.

According to Kyodo News, the Japan Meteorological Agency has been unable to send some data from the local meteorological observation system, which handles observation information such as temperature and precipitation. It has been confirmed to be affected.

The system that provides location information for some bus companies operating in the metropolitan area was paralyzed, and the wireless equipment used by Japan Airlines staff at Narita and Haneda Airports did not work, causing business disruption.

In the case of Ogaki Kyoritsu Bank, a regional bank based in Gifu Prefecture, 190 out of 221 automatic teller machines (ATMs) installed in the four prefectures: Gifu, Aichi, Mie and Shiga since the morning of the 2nd did not work properly.

The Nihon Keizai Shimbun analyzed that the impact of this communication failure was particularly great as KDDI accelerated its Internet of Things (IoT) business for corporate customers and was providing about 24.5 million lines as of the end of March of this year. .