Recently, by impersonating acquaintances and children and contacting them via KakaoTalk or text message, they said that their phone was broken, so they couldn't call, and they couldn't authenticate themselves. Card information, etc.) and inducing remote programs to be installed, so-called'messenger phishing' scam crimes are in vogue.
If personal information is leaked due to such scams, your name may be stolen and your mobile phone may be opened or an account may be opened.
This is a manual to quickly check and cope with this.