https://itmanual.net/%ea%b0%a4%eb%9f%ad%ec%8b%9c-%ec%95%84%ec%9d%b4%ed%8f%b0-%eb%93%80%ec%96%bc%eb%a9%94%ec%8b%a0%ec%a0%80-%ec%82%ac%ec%9a%a9-%eb%b0%a9%eb%b2%95-%eb%b9%84%ea%b5%90-esim/