Continuing Docomo communications outage: Most services restored, but not fully resolved; cause under investigation - ITmedia NEWS

　NTT DOCOMO announced on November 11 that services had been restored for most subscribers, with some exceptions, in connection with the communications outage occurring nationwide from around 10:34 a.m. that day. However, as of 4:30 p.m., full restoration had not yet been achieved, and the company was continuing its response.

　Those affected were “5G SA” subscribers who communicate only through dedicated 5G equipment. Voice calls, data communications, and SMS were difficult to use. The company said there was no impact on subscribers of 5G or 4G services other than 5G SA, MVNOs that use DOCOMO lines, or emergency calls.

　The cause is under investigation. According to the company, as of 4:30 p.m. on the 11th, no signs of unauthorized access or events indicating a cyberattack had been confirmed. Users are being advised that, if they have difficulty connecting, they should select “4G” in their device’s network settings and then restart the device, or turn airplane mode on once and then off.

　A nationwide communications outage also occurred on November 5, affecting 5G SA subscribers. Service was restored approximately 14 hours later, at around 1:20 a.m. on the 6th. The cause at the time was that communications traffic became concentrated on the switch handling communications for 5G SA subscribers, resulting in processing falling behind.