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https://hanzama.x0.to/2020/08/30/the-5g-frequency-will-be-used-for-5g-expansion-in-new-frequencies-and-the-5g-frequency-band-will-be-cautious/
新周波数で5G展開を進めるドコモ 4G周波数の5G転用は慎重(ASCII.jp)