JP — ITmedia

NTT Docomo outage restored after about 14 hours; cause was switching equipment congestion, no signs of unauthorized access

DevicesNovember 6, 20261 min read

NTT Docomo, a major Japanese phone company, had a nationwide outage on its 5G SA service that lasted about 14 hours. The company says it was fixed on November 6, 2026, and it found no sign of hacking.

What happened

On November 5, 2026, at about 11:18 a.m., Docomo's 5G SA phone service stopped working across Japan. Customers on this service had trouble with voice calls, data, and text messages (SMS). The service was restored at about 1:20 a.m. on November 6. Docomo said the cause was congestion, or overload, in the switching equipment that handles 5G SA customers.

Key facts

Outage start: November 5, 2026, about 11:18 a.m.
Outage end: November 6, 2026, about 1:20 a.m.
Length: about 14 hours
Affected: only customers who use the 5G SA service
Not affected: other Docomo customers, MVNOs (companies that rent Docomo's network), and emergency calls

What is 5G SA?

5G SA stands for 5G Standalone. It is a plan that uses only 5G equipment, not the older 4G network. Docomo says it keeps phones fast even when 4G is crowded.

Why it matters

The outage left many users unable to call, use data, or send texts for most of a day. Docomo says there was no sign of a cyberattack. Still, the company asked users to restart their phones or turn Airplane Mode on and off. Users who changed their settings to 4G as a temporary fix should change them back.

What to watch

Whether Docomo explains in more detail why the switching equipment became overloaded
Whether users who changed to 4G return to 5G SA settings
Whether Docomo's investigation finds any other cause

Glossary

5G SA: 5G Standalone, a mobile service that uses only 5G equipment instead of 4G.
SMS: Short Message Service, the text messages sent between phones.

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