https://purengom.com/2010/07/01/iphone-%eb%b0%b0%ed%84%b0%eb%a6%ac-%ea%b5%90%ed%99%98-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-%ec%a0%95%ec%b1%85%ec%9d%80-%ec%96%b4%eb%96%bb%ea%b2%8c-%eb%90%a0-%ea%b2%83%ec%9d%b8%ea%b0%80/