https://qooah.com/2012/10/21/lg-optimus-g-%e5%af%a6%e6%8b%8d%e5%85%a8%e9%ab%98%e6%b8%85%e5%bd%b1%e7%89%87%ef%bc%8c%e6%80%a7%e8%83%bd%e5%bc%b7%e5%8b%81-2/