Wi-Fiが利用可能な場所では、通話とテキストメッセージにWi-Fiを使用しコスト削減。今後のトレンドとなるのか？
Republic Wireless charges just $19 a month for a smartphone account with unlimited data, voice and text — and no contract.
Voice and text are handled by Wi-Fi whenever possible to minimize costs. Is this the wave of the future?
http://finance.yahoo.com/news/19-unlimited-phone-plan-flaws-033500230.html
