SIM Swap API (ベータ版)

A SIM swap, a type of fraud in which scammers take control of your phone number by transferring it to a SIM card they own, happens when your mobile carrier is tricked into believing it is you.

A SIM swap works by a scammer impersonating the victim and convincing their mobile carrier to transfer the victim's phone number to a SIM card controlled by the scammer. Through phishing or data breaches, the fraudster typically gathers personal information, such as the victim’s name, address, and phone number. Once the scammer has enough information, they contact the mobile carrier, pretending to be the victim, and request the SIM swap.

Once the transfer is successful, the scammer can access the victim’s phone number and receive calls and text messages, including critical information like two-factor authentication codes sent by banks or other services. This enables the fraudster to reset passwords, access accounts, and commit crimes.

Yes, SIM swaps are illegal. Fraudsters use SIM swapping to commit identity theft and financial fraud. Carriers and law enforcement agencies take these crimes seriously and work to prevent and prosecute them.

If you believe you've been SIM swapped, immediately contact your mobile carrier to regain control of your account. Also, change passwords for important accounts, enable multi-factor authentication, and monitor your accounts for any unauthorized activity.

To prevent SIM swap fraud, secure your mobile carrier account with a strong PIN or password only you know. Many carriers also offer additional security features, such as account lock options, which prevent unauthorized changes to your account.

Additionally, avoid sharing personal information online or with untrusted sources, as scammers often use this data to impersonate you. Enable two-factor authentication (2FA) on your accounts using an app instead of SMS, which is more secure. Stay alert for signs of fraud, like unexpected loss of service, and contact your carrier immediately if you suspect a SIM swap.

A SIM swap is a fraudulent act where a scammer transfers your phone number to a new SIM card they control. This allows them to access your accounts and intercept calls and texts, including two-factor authentication codes.

Porting, on the other hand, is a legitimate process where you transfer your phone number from one carrier to another, typically when switching service providers. While porting requires verification steps to ensure the request is genuine, scammers can exploit this process if they obtain enough of your data.

A SIM replacement differs from a SIM swap as it is a legitimate process where a mobile carrier issues a new SIM card to a customer, typically when the original SIM is lost, damaged, or needs upgrading. The phone number and account remain the same, and the customer requests the replacement. Unlike a SIM swap, a SIM replacement is done with the customer's consent.