Movistar battles spam calls with ai, but is it enough?
Spain's largest telecom provider, Movistar, is throwing its considerable weight behind a new initiative aimed at curbing the relentless tide of spam calls plaguing its subscribers. The campaign, dubbed “¿Sí? Vuelve a Contestar” (Answer Again?), isn’t just about blocking numbers; it leverages predictive AI to identify and filter potentially fraudulent calls before they even ring your phone. But in a landscape where scammers are constantly adapting, can even a tech giant like Telefónica truly stem the flow?
The scale of the problem: millions of fraudulent connections
The issue, Movistar asserts, has ballooned beyond mere annoyance. They report millions of fraudulent connections each month, a far cry from the occasional nuisance call. This isn’t simply about unwanted sales pitches; it's a full-blown crisis of confidence in a fundamental communication channel. The “Spam Calls” filter, the core of Movistar’s strategy, operates within their network, analyzing call behavior in real-time. Unlike traditional blacklist approaches – which are notoriously ineffective – this system identifies patterns indicative of mass spam, aggressive telemarketing, or outright scams.
Upon detecting such behavior, users receive a clear notification on their phones: a label reading “Spam” or “Fraudulent Call,” allowing them to decide whether or not to answer. Movistar claims this service is automatic, free, and enabled by default for most customers – a welcome, if belated, response to consumer frustration. The company boasts a staggering 190 million fraudulent calls blocked since March 2025, achieving a detection rate nearing 97%. But those numbers require scrutiny.
Beyond the network: app-based control and legal hurdles
The battle against unwanted calls doesn’t end at the network level. Movistar and O2 have introduced a supplementary feature within the Mi Movistar app, allowing users to proactively block unwanted calls. While not activated by default—a curious choice, given the urgency of the issue—users can easily enable the feature by verifying their identity and navigating to the “Network Protection” section. The process is straightforward, but the reliance on user action introduces a potential vulnerability.
The reality is that no system is foolproof. There’s always a risk of misidentification, flagging a legitimate call as spam. While Movistar assures that only calls with a “very high probability” of being spam are blocked, the potential for error remains. And as Spain grapples with this pervasive problem, a new law, the Ley de Servicios de Atención a la Clientela (SAC), is slated to take effect in early 2026, attempting to address the root causes of spam. Previous legislation proved easily circumvented, with companies exploiting loopholes in consent requirements and operating from foreign call centers. The SAC aims to close those gaps, prohibiting the purchase or manipulation of online reviews, limiting customer service wait times, and requiring clear disclosure of subscription renewal terms.
The key takeaway? While Movistar’s AI-powered filter offers a significant step forward, the fight against spam calls is an ongoing arms race. Legislative changes, combined with continued technological innovation, are essential to restore trust in our phones—a tool that has, for many, become a source of anxiety rather than connection.