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https://hanzama.x0.to/2020/05/28/rakuten-mobile-and-rakuten-mini-will-be-sold-for-a-single-yen-unlimited-capacity-for-one-year-of-free/
楽天モバイル、スマホ「Rakuten Mini」を1円で販売。容量無制限回線の1年間無料