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https://ja.hideki.hclippr.com/2009/07/15/google-voice%e3%81%a8%e7%84%a1%e5%88%b6%e9%99%90%e9%9b%bb%e8%a9%b1%e3%83%97%e3%83%a9%e3%83%b3%e3%81%ae%e5%b4%a9%e5%a3%8a/
Google Voiceと無制限電話プランの崩壊