When your mobile phone number appears in a massive breach (like the 533M Facebook scrape or telecom carrier leaks), you become a primary target for SIM-swap attacks and automated smishing campaigns. Follow this immediate lockdown protocol.
EMERGENCY ACTION 1: Set Carrier Port-Out Protection
Call your cellular provider (Verizon, AT&T, T-Mobile, Vodafone) and request immediate activation of a Port-Out Freeze / Account PIN. This prevents an attacker from impersonating you and porting your number to an eSIM under their control.
EMERGENCY ACTION 2: Eliminate SMS Two-Factor Authentication
SMS verification is fundamentally insecure. Immediately migrate your email, banking, and crypto exchange 2FA to hardware keys (YubiKey) or authenticator apps (Aegis, Ente, 1Password).