Verizon now makes it possible for customers to defend against SIM swapping attacks by enabling the free Number Lock protection feature through the My Verizon app or the My Verizon website.
SIM swapping (aka SIM hijacking, SIM splitting, or SIM jacking) is a type of account takeover (ATO) fraud that allows criminals to take control of a target's phone number by convincing their mobile phone service providers to swap the mobile number to an attacker-controlled SIM card by using social engineering or with the help of a bribed employee.