SIM swap and account takeover precautions

[Shadow Trader]

A SIM swap occurs when an attacker convinces a mobile carrier to transfer a victim's number to a SIM they control, intercepting text messages, including verification codes. Combined with stolen credentials, it can lead to account takeover, including trading and exchange accounts.

Protections start with moving away from SMS for authentication. Authenticator apps and hardware security keys are much harder to hijack. Where a broker only supports SMS, a separate number used only for that purpose, kept private, reduces exposure.

Contact the mobile carrier to add a PIN or password for account changes, and ask about port-out protection. Avoid publishing the phone number or linking it widely.

Use unique, strong passwords with a password manager. Enable withdrawal whitelists and email confirmations where available. Monitor accounts for unusual login alerts.

Signs of a SIM swap include sudden loss of mobile service and unexpected notifications of changes to accounts. Immediate action, calling the carrier from another phone and contacting the broker, limits the damage.

Treating the phone number as a security asset, not just a contact detail, is the mindset shift.

A simple audit takes fifteen minutes: list every account that uses the phone number for recovery, change the most sensitive ones to authenticator apps or security keys, and store recovery codes offline. That single session closes most of the common attack paths.

Which authentication methods protect the trading accounts, and is SMS still used anywhere?