www.itmedia.co.jp/news/articles/2604/01/news083.html
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災害時などに携帯キャリア同士で通信網を融通「JAPANローミング」きょう開始 - ITmedia NEWS
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https://www.itmedia.co.jp/news/articles/2604/01/news083.html
About this page
This page announces the launch of "JAPAN Roaming" on April 1, 2026. The system allows mobile carriers to share their networks during major disasters or communication failures. Participating carriers include NTT DoCoMo, SoftBank, KDDI, and Rakuten Mobile. They provide 4G LTE networks to affected users. The service is provided by municipality and includes two options: emergency calls only to police and fire departments, or full roaming with voice calls, data communication up to 300bps, and SMS. The specific service type is determined by carrier consultation.
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