https://itmanual.net/skt-esim-%ea%b0%9c%ed%86%b5-%ec%8b%a0%ec%b2%ad-esim%ec%9d%b4%eb%9e%80-usim%ec%b0%a8%ec%9d%b4-%ec%9e%a5%eb%8b%a8%ec%a0%90/