https://purengom.com/2010/07/22/iphone%ec%9d%80-%ec%a0%9c%ea%b0%80-%ea%b0%80%ec%a7%84-%ec%a0%84%ed%99%94%ea%b8%b0-%ec%a4%91%ec%97%90%ec%84%9c-%ea%b0%80%ec%9e%a5-%ec%a6%90%ea%b1%b0%ec%9a%b4-%ec%a0%84%ed%99%94%ea%b8%b0%ec%9e%85/