Docomo Communication Disruption Due to Forest Fire in Iwate Prefecture: How the Newly Introduced "JAPAN Roaming" Works and Key Points to Note

A wildfire in Otsuchi, Iwate disrupted NTT Docomo 4G/5G service after power and transmission line failures.

In response, JAPAN Roaming’s full roaming service was launched for the first time, allowing users to switch to other carriers’ networks during the disaster.

The case highlights a real-world backup option for keeping calls and data available when a carrier’s own network is down.

It also underscores the importance of understanding roaming settings and manual network selection in emergencies.