https://purengom.com/2010/07/09/sc%ec%a0%9c%ec%9d%bc%ec%9d%80%ed%96%89-iphone-%eb%b1%85%ed%82%b9-%ec%96%b4%ed%94%8c%eb%a6%ac%ec%bc%80%ec%9d%b4%ec%85%98-%ec%b6%9c%ec%8b%9c/