携帯料金の値上げが相次いでいる理由–ドコモに続いてKDDIも… ソフトバンクと楽天はどうなる?

値下げが続いていた携帯料金。ところが2025年5月、ドコモとKDDIが値上げの新料金プランを発表。その背景には何があったのか?


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