https://purengom.com/2009/11/22/iphone%ec%97%90%ec%84%9c-%ec%9e%84%ec%9d%98%ec%9d%98-%eb%b2%a8%ec%86%8c%eb%a6%ac-%eb%b3%80%ea%b2%bd%ed%95%98%ec%97%ac-%ec%82%ac%ec%9a%a9%ed%95%98%ea%b8%b0/