Movistar battles spam calls with ai, aims to restore trust

Telefónica, under its Movistar brand, is waging a full-scale war against spam calls, deploying a new network security tool dubbed “Vuelve a contestar ¿sí?” (Answer Again, Yes?). The initiative represents a significant shift in strategy, attempting to proactively filter fraudulent calls before they even reach users' mobile devices, a problem that has spiraled to millions of connections per month.

Predictive ai: the new front line

For years, users have been bombarded with unwanted calls, eroding trust in a fundamental communication channel. Traditional methods relying on blocked number lists have proven largely ineffective. Movistar’s new approach utilizes intelligent, predictive models that analyze call behavior in real-time, identifying patterns characteristic of mass spam, aggressive telemarketing, and outright scams. When a call entering Movistar’s network exhibits these telltale signs, users receive an on-screen notification—a clear “Spam” or “Fraudulent Call” label—allowing them to decide whether to answer or ignore.

The service is reportedly automatic and free for most customers and the company trumpets impressive results. Since March 2025, Movistar claims to have blocked over 190 million fraudulent calls within Spain, boasting a detection rate nearing 97%. This is a staggering number, and while skepticism is warranted, the sheer scale of the operation is undeniable.

Beyond the network: app-based control and legal overhaul

But the fight doesn’t end with network-level filtering. Movistar, alongside O2, has introduced a new feature accessible through the Mi Movistar app. Users can now actively block unwanted calls before they ring, adding another layer of control. While not enabled by default, the setup process is straightforward, requiring verification via DNI or telephone line and navigating to the “Protección de Red” (Network Protection) section.

However, as with any such system, there's a risk of false positives—legitimate calls being flagged as spam. While Movistar emphasizes the low probability of this occurring, it’s a reality users must accept. The company’s approach prioritizes caution, only blocking calls with a high probability of being fraudulent.

The broader context here is a shifting legal landscape. Spain is attempting to finally curb the relentless tide of spam through the newly enacted Law of Services for Customer Attention (SAC), effective early 2026. This legislation addresses loopholes exploited by previous regulations, requiring explicit consent for communication and preventing the use of foreign call centers to circumvent restrictions. It also outlaws the purchasing and manipulation of online reviews, a common tactic used to mislead consumers.

The SAC law also includes stipulations regarding subscription renewals, requiring platforms like Netflix and Apple TV to provide 15-day advance notice and allowing users to easily cancel. Furthermore, it establishes a three-minute wait time limit for customer service calls, addressing a common source of frustration. The fight against spam is far from over, but Movistar’s aggressive strategy and the evolving legal framework signal a determined effort to reclaim the integrity of the telephone network.

The sheer volume of spam attempts—thousands daily, often impersonating entities like Indeed or Infojobs—underscores the depth of the problem. While Movistar’s efforts represent a significant step forward, vigilance and user empowerment remain crucial in the ongoing battle against unwanted intrusions.