Japan’s largest mobile carrier reported a nationwide communications snarl on Thursday that it later narrowed to one slice of its 5G lineup. NTT Docomo’s sixth update, stamped 5:00 p.m. JST Nov. 5 (12:00 a.m. PT), says voice calls, data and SMS on its 5G SA (Standalone) service have proved hard to use across the country since about 11:18 a.m. JST (6:18 p.m. PT Wednesday). The carrier’s @docomo account posted matching apologies through the afternoon Japan time. This desk read the Japanese notices and English wire copy through saved snapshots and the X API.
Docomo’s own scope note now cuts against its earliest public framing and against first-wave wire copy. The sixth notice says the event hits only customers who hold a 5G SA contract; other 5G users, 4G users and mobile virtual network operators that ride Docomo’s network face no impact, and emergency numbers also face no impact. ITmedia Mobile walked readers through that narrowing: early notices described a broad Docomo and MVNO problem and listed emergency-call effects as still under review, while the third notice and later updates confined the hit to 5G SA and cleared emergency calls. TBS NEWS DIG via Yahoo News and Minaminihon Broadcasting likewise reported the 5G SA-only frame and the 4G-switch workaround by mid-afternoon Japan time.
For customers stuck on 5G SA, Docomo’s guidance stays simple. The carrier tells users to pick 4G in network settings, then restart the phone or toggle airplane mode on and off, and says those steps may restore voice, data and SMS. It still lists no restoration timeline and says it will publish a new notice when it has one. ITmedia’s roundup of social posts described work calls, payments and ticket buys failing while bars on some phones still looked normal — color this desk treats as user reports, not as a measured outage map.
On the network cause, Docomo’s fifth and sixth notices say the same thing: investigators continue to dig, and so far they report no signs of unauthorized access or a cyberattack before or after the event. That line matters because a separate Docomo notice from the same morning describes a different security judgment about different systems.
Hours before the 5G SA snarl, Docomo froze customer self-service tools. Its apology notice on the Docomo online shop and My docomo, stamped 9:00 a.m. JST Thursday, says emergency maintenance began around 1:05 a.m. JST (4:05 p.m. PT Wednesday) and still continues. The carrier wrote that it judged an outside party appears highly likely to have gained unauthorized access to its servers, so it stopped the services to investigate scope and cause. The notice says customers who need urgent plan, bill or contract changes may still handle them at Docomo shops and other retail counters. Docomo’s @docomo post on the shop outage matches that timeline.
English wires tied the two episodes together as same-day context without claiming one caused the other. Kyodo News wrote Thursday that Docomo faced nationwide service disruptions from about 11:18 a.m., that early reports also described knock-on effects for providers using Docomo’s network, and that the carrier still checked emergency calls — language that tracks Docomo’s early notices, not the later 5G SA-only update. Kyodo separately reported the overnight shop and My docomo suspension after Docomo concluded an outside party had likely gained unauthorized access, and it said Docomo left unclear whether that incident linked to the mobile disruptions. Anadolu Agency, citing Kyodo, repeated that pairing and the same caution on any link.
This desk therefore treats the episodes as parallel until Docomo or a primary investigator says otherwise. The network notice explicitly reports no unauthorized-access signs so far; the shop notice explicitly reports a high likelihood of unauthorized server access. Readers who saw only the morning shop headline or only the early Kyodo/AA copy may over-read a single cyber story across both systems. Docomo has not published a restoration time for either track.
ITmedia’s later updates also logged Docomo’s fourth notice (about 3:00 p.m. JST) as carrying no new facts beyond ongoing restoration work, and its fifth notice (about 4:00 p.m. JST) as adding the no-unauthorized-access line for the network event. By the sixth notice at 5:00 p.m. JST, Docomo said the fifth notice’s facts still stood. MBC’s evening piece summarized the same 5G SA option — a free add-on that keeps a phone on 5G-only paths — and again separated the shop freeze from the radio-access trouble.
This desk checked Docomo’s sixth network notice and shop notice, ITmedia Mobile’s update chain, TBS NEWS DIG via Yahoo News, Minaminihon Broadcasting, Kyodo’s English report, Anadolu Agency’s Kyodo-based piece, and @docomo status posts on X. JST times convert here to Pacific Time (UTC−8). Early wire copy that still describes MVNO impact or open emergency-call checks reflects Docomo’s first notices; this article follows Docomo’s later, narrower notices for current scope.