SIM Swap Scams in Brazil
Criminals hijack Brazilian mobile numbers by fraudulently porting them to a new SIM, then drain bank accounts and crypto wallets that rely on SMS authentication.
Part of: SIM Swap Scams
Last reviewed: 1 June 2026
SIM swap fraud is particularly acute in Brazil due to the country's reliance on SMS one-time passwords for banking, PIX transfers, and WhatsApp account authentication. Once a fraudster controls a victim's number, they can intercept two-factor authentication codes for every linked service.
Brazil's major carriers — Claro, Vivo, TIM, and Oi — have been targeted by fraudsters who bribe or trick carrier employees, or forge identity documents to request an unauthorized SIM swap at a store.
How this scam works on Brazil
Fraudsters first gather personal data about the target: full name, CPF, date of birth, and carrier. This information is obtained through data breaches, phishing, or social engineering calls. Armed with this data, they visit a carrier store in person or call customer support to request a SIM transfer, impersonating the account holder.
Once the new SIM is activated, the victim's phone loses signal. Within minutes, the fraudster uses intercepted SMS codes to reset banking passwords, authorize PIX transfers, and take over WhatsApp. Because WhatsApp is Brazil's primary communication platform, takeover of the account also enables the fraudster to scam the victim's contacts by asking for emergency money transfers.
The scale of losses can be significant: PIX transfers are near-instant and irreversible, and Brazilian banks have reported substantial fraud linked to SIM swap attacks.
Common red flags
- Your mobile phone suddenly loses signal or shows 'no service' without explanation
- You receive an SMS confirmation for a SIM swap you did not request
- Bank or PIX app sends verification codes you did not initiate
- WhatsApp shows a 'registered on a new device' notification you did not trigger
- Contacts report receiving unusual money requests from your WhatsApp number
How to protect yourself
- Set a PIN or password for SIM changes directly with your carrier (available at Claro, Vivo, TIM stores and apps)
- Replace SMS-based two-factor authentication with an authenticator app for banking and email wherever possible
- Contact your carrier immediately if you inexplicably lose mobile signal
- Enable app-based login for WhatsApp and activate two-step verification in WhatsApp settings
- Monitor PIX and banking activity through real-time notifications and act immediately on suspicious alerts
How to report it
- Contact your carrier's fraud department immediately and request an emergency SIM lock
- Notify your bank's fraud line and request a temporary account freeze
- File a complaint with ANATEL (Brazil's telecoms regulator) at anatel.gov.br/consumidor
Frequently asked questions
Can I set a PIN to prevent unauthorized SIM swaps on Brazilian carriers?
Yes. All major Brazilian carriers allow you to set a security PIN or password for account changes. Contact your carrier's customer service or visit a store to activate this protection.