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https://hanzama.x0.to/2020/06/13/rakuten-mobile-the-ministry-of-internal-affairs-and-communications-mic-will-ask-the-ministry-of-internal-affairs-and-communications-to-report-the-response-frequency-band-of-the-companys-smartphone/
楽天モバイル、同社スマホの対応周波数帯を無断で変更 総務省が報告求める(ITmedia NEWS)