Ring, Reject, Repeat: South Africa’s Spam Call Crisis

Why It Matters

The crisis threatens operator revenue streams and erodes consumer trust in traditional voice services, prompting urgent industry and regulatory action. Effective mitigation will be critical for preserving the viability of mobile voice ecosystems in an increasingly data‑centric market.

Key Takeaways

• 30 billion spam calls in South Africa 2025.
• Spam calls up 20% YoY Q1 2026.
• Users increasingly ignore unknown numbers, affecting voice traffic.
• Operators cite OTT shift, not spam, as main revenue driver.
• AI call screening (Truecaller, Apple) emerging mitigation.

Pulse Analysis

The spike in unsolicited calls is not merely a nuisance; it reflects a deeper shift in how South Africans interact with mobile networks. As Truecaller’s data shows, the sheer volume—30 billion calls in 2025 and a 20% increase early 2026—has conditioned users to treat unknown numbers as potential threats. This behavioural change reduces the likelihood of answering legitimate calls, diminishing the value of traditional voice minutes for operators already grappling with a long‑term decline driven by OTT platforms like WhatsApp, Teams, and Zoom.

For mobile carriers, the challenge is two‑fold: protect customers from fraud while preserving the revenue potential of voice services. Cell C and MTN acknowledge that spam is a symptom rather than the primary cause of falling voice traffic, pointing to the migration toward data‑centric communication as the dominant factor. Nonetheless, they are investing in layered, industry‑aligned spam detection and collaborating with regulators to tighten network security. These efforts aim to restore confidence in the voice channel, which remains essential for certain services such as recruitment, emergency alerts, and B2B outreach.

AI‑driven call screening emerges as the most promising countermeasure. Truecaller’s subscription tier now offers real‑time transcription and voice‑assistant verification, while Apple’s native iOS 26 feature extends live call transcripts across the Apple ecosystem. By providing users with actionable information before they answer, these tools reduce the friction of spam while preserving legitimate call flow. As adoption grows, AI screening could become a standard expectation, reshaping the competitive landscape for both telecoms and app developers seeking to capture voice‑related revenue in a data‑first world.