https://qooah.com/2012/02/06/%e9%99%b0%e8%ac%80%e8%ab%96-smartone%e5%8f%96%e6%b6%88%e7%84%a1%e9%99%90%e4%b8%8a%e7%b6%b2%e5%8f%aa%e7%82%ba%e8%87%aa%e4%bf%9d/