How to Block Spam Calls and Prevent Phone Scams

The proliferation of automated spam calls and phone-based scams in Brazil has reached a level that is prompting experts to recommend specific legal and technical countermeasures. Recent reports indicate a shift in the tactics used by scammers, specifically the increase in silent calls, which serve as a reconnaissance tool for larger fraudulent operations.

These silent calls occur when a user answers the phone, only to be met with silence before the call is disconnected. According to reporting from Band, this is not a technical glitch but a deliberate strategy to verify that a phone number is active and that a human will answer. Once a line is confirmed as active, it is flagged in a database and often sold to other criminal organizations or used for more targeted phishing attempts.

The business model behind these calls relies on the use of predictive dialers—software systems that can dial thousands of numbers simultaneously. When a person answers, the system registers the interaction. If a human voice is detected, the number is marked as a verified lead. These verified lists command a higher price on the black market because they guarantee a higher success rate for scammers attempting to execute more complex frauds, such as fake bank alerts or social engineering schemes.

To combat this, specialists are suggesting a shift from passive avoidance to active legal demand. As reported by Super Rádio Tupi, a simple phrase can be used to disrupt the cycle of spam. When a consumer identifies a telemarketing call, they are encouraged to explicitly request the removal of their data from the company’s database, citing the Lei Geral de Proteção de Dados (LGPD), Brazil’s comprehensive data protection law.

The LGPD, which governs the processing of personal data in Brazil, grants individuals the right to access, correct and delete their personal information held by companies. By formally requesting the deletion of their phone number, consumers place a legal obligation on the company to comply or face potential regulatory penalties. Experts suggest that stating the request clearly and mentioning the LGPD signals to the company that the consumer is aware of their legal rights, which can increase the likelihood of the number being removed from marketing lists.

Beyond individual requests, You’ll see systemic tools available for Brazilian consumers to reduce the volume of unwanted calls. The Não Me Perturbe registry is a centralized platform where users can register their numbers to opt out of telemarketing calls from major telecommunications and financial institutions. This registry acts as a business-facing filter, allowing legitimate companies to scrub their calling lists against a database of users who have explicitly denied consent for marketing.

However, the registry does not cover all entities, particularly fraudulent operations that ignore legal frameworks. In such cases, G1 reports that experts recommend reporting abusive telemarketing and scams directly to Anatel, the Agência Nacional de Telecomunicações. Reporting these incidents helps the regulator identify patterns of abuse and take enforcement actions against the carriers or companies facilitating the calls.

The business impact of these scams extends beyond individual annoyance. The growth of silent call networks indicates a sophisticated industry of data harvesting and validation. This environment creates a trust deficit in voice communications, potentially affecting legitimate business outreach and increasing the reliance on encrypted messaging apps for professional communication.

As automated systems become more advanced, the burden of defense has shifted toward the consumer. This requires a combination of regulatory tools, legal knowledge of the LGPD, and the use of call-filtering technology to maintain digital security and productivity in an increasingly automated communication landscape.