A scam used to intercept online banking SMS verification codes. To get hold of one-time passwords for financial transactions, cybercriminals create or fraudulently obtain a copy of the victim’s SIM card — for example, pretending to be the victim, the attacker might claim to have lost their SIM card and request a new one from the mobile operator.
To protect clients from such schemes, most banks require that a replacement SIM card be relinked to the account.