NTT DOCOMO announced that around 11 a.m. on November 11, voice calls, data communications, and SMS over its mobile phone service were difficult to use nationwide. The time of occurrence and scope of the impact are “under investigation.” The restoration time has not yet been determined.

From DOCOMO’s announcement

 DOCOMO is describing the scope of the impact as “under investigation,” but on X, some users are reporting that “5G SA won’t connect” and “It connected when I switched to 4G.”

 On November 5, DOCOMO also experienced a nationwide outage that made voice calls, data communications, and SMS difficult to use. The affected customers were subscribers with a “5G SA” contract, and it took approximately 14 hours to restore service.

 During the outage, DOCOMO had advised that “in some cases, you can use the service by selecting 4G in the network settings and either restarting your mobile phone or turning airplane mode on/off.”

 5G SA is an option that communicates using only dedicated 5G equipment. It is claimed to be unaffected by congestion in 4G communications and to enable smooth communications.