The South African telecommunications landscape underwent a seismic shift in 2025, characterized by a paradox that has left industry giants grappling with a new economic reality: while citizens are communicating more than ever, the revenue generated from traditional mobile services has plummeted. According to the latest State of the ICT Sector report released by the Independent Communications Authority of South Africa (Icasa), national voice traffic witnessed a staggering surge of 21.5%, reaching a total of 88.6 billion minutes. However, this spike in activity did not translate into financial gain for mobile network operators. Instead, mobile services revenue saw a massive contraction of ZAR 10.4 billion (approximately USD 635 million), signaling a fundamental change in how South Africans consume digital services.

The comprehensive report highlights a nearly 8% decline in total mobile revenue, which fell to ZAR 122 billion (USD 7.4 billion). This downturn was not isolated to a single department but was felt across every major revenue stream. Voice revenue dipped by 2%, data revenue declined by 3%, and roaming revenue saw a 12% contraction. Most dramatically, the traditional Short Message Service (SMS) witnessed a near-total collapse, with revenue falling by 38% in a single year. The primary driver behind this disruption is the ubiquitous adoption of Over-The-Top (OTT) platforms, specifically Meta-owned WhatsApp, which has effectively replaced traditional carrier services for the majority of the population.

The WhatsApp Effect and the Death of the SMS

For over a decade, mobile network operators (MNOs) in South Africa, such as Vodacom, MTN, and Telkom, relied on voice minutes and SMS charges as their primary "cash cows." However, the 2025 data confirms that the transition to OTT messaging and calling applications is no longer a trend but a completed migration. South Africans have moved their personal conversations, business communications, and group interactions to WhatsApp and similar platforms like Telegram and Signal.

The Icasa report explicitly identifies this shift, stating that the declines in SMS and voice revenue are consistent with long-term substitution toward OTT communication applications. While consumers are technically "talking" more—as evidenced by the 88.6 billion minutes recorded—they are doing so via data-driven voice-over-IP (VoIP) services. Because these calls are often made over Wi-Fi or bundled data packages that offer lower margins for telcos, the direct profitability of "a minute of conversation" has eroded.

The 38% crash in SMS revenue is perhaps the most telling statistic. Once a premium service, SMS is now largely relegated to receiving One-Time Pins (OTPs) for banking and marketing spam. For person-to-person communication, it has become virtually obsolete in the South African market, replaced by the rich-media capabilities and zero-rated or low-cost nature of WhatsApp messaging.

A Statistical Breakdown of the Mobile Revenue Decline

To understand the scale of the financial impact, one must look at the specific figures provided in the State of the ICT Sector 2026 report. The ZAR 10.4 billion loss in mobile services revenue represents a significant hit to the capital expenditure budgets of major telcos.

1. Total Mobile Revenue: Dropped from previous highs to ZAR 122 billion (USD 7.4 billion), a nearly 8% year-on-year decrease.
2. Voice Revenue: Despite the 21.5% increase in minutes used, revenue fell by 2%. This indicates that the "per-minute" value has been decimated by the shift to internet-based calling.
3. Data Revenue: Surprisingly, even data revenue fell by 3%. While data usage is increasing, intense competition, regulatory pressure to lower data costs, and the proliferation of uncapped fibre offerings have forced mobile data prices down faster than consumption can offset.
4. Text Messaging: The 38% collapse marks the end of an era for SMS as a viable commercial product for general consumers.
5. Roaming Revenue: A 12% decline suggests that even international and inter-network travel is being serviced by local eSims or ubiquitous Wi-Fi, bypassing traditional roaming charges.

The Strategic Pivot: Following the Fibre

While the mobile sector is bleeding revenue, the broader telecommunications industry in South Africa managed a slight growth of 1.6%, bringing total revenue to ZAR 236 billion. This growth was driven almost entirely by the fixed broadband sector. The industry is witnessing a "Great Pivot" where investment and revenue are moving from the airwaves to the ground.

Fibre-to-the-home (FTTH) subscriptions in South Africa crossed the three-million mark for the first time in 2025, representing a 22% increase. Consequently, fixed internet revenue jumped by 16%, reaching ZAR 41 billion. The financial markets and the telcos themselves are reacting to this shift; infrastructure investment in fixed-line networks rose by 12%, while investment in mobile infrastructure was slashed by a significant 21%.

This redirection of capital suggests that operators are bracing for a future where they are no longer "service providers" in the traditional sense, but "pipe providers." As consumers demand high-speed, uncapped internet to fuel their streaming and social media habits, the telcos are prioritizing the deployment of fibre optics over the expansion of 5G mobile towers in certain urban corridors.

Regulatory Reckoning: Taxing the "Free Riders"

The massive revenue loss to OTT platforms has reignited a long-standing debate in the South African regulatory space: should global tech giants pay for the use of local network infrastructure? Mobile operators have long argued that companies like Meta (WhatsApp/Facebook), Google (YouTube), and Netflix are "free riders" who profit from networks built and maintained by local telcos without contributing to the underlying costs.

In response to the 2025 data, Icasa has recommended a "comprehensive market enquiry into OTT communication and streaming services." This move signals that the regulator is looking for ways to stabilize the local ICT sector.

Furthermore, a draft white paper on audio and audiovisual media services is currently under consideration. The proposal suggests introducing licensing obligations for global streaming platforms once they reach certain revenue thresholds within South Africa. If implemented, this could mean that WhatsApp, Netflix, and YouTube would be required to pay regulatory fees or contribute to a universal service fund, effectively subsidizing the networks they currently use for free.

Industry Reactions and Economic Implications

While the telcos have not officially commented on the "theft" of revenue in those exact terms, their financial reports throughout 2025 reflected a somber mood. Executives at Vodacom and MTN have frequently pointed toward the "disproportionate" relationship between data traffic growth and revenue growth.

Market analysts suggest that the USD 635 million loss will have a ripple effect on the South African economy. A 21% reduction in mobile infrastructure investment means that the "Digital Divide" may widen in rural areas. While urban centers are getting faster fibre, rural communities—which rely almost exclusively on mobile towers for connectivity—may see slower upgrades to 5G or 6G technologies as operators prioritize more profitable fibre projects.

However, from a consumer perspective, the "WhatsApp effect" has been a net positive. The cost of communication has plummeted. A South African who previously spent hundreds of Rands on airtime for voice calls and SMS can now achieve the same level of connectivity with a small data bundle or a shared Wi-Fi connection. The 21.5% increase in talk time is a testament to the democratization of communication made possible by the very platforms that are hurting the telcos’ bottom lines.

The Road Ahead: 2026 and Beyond

The findings of the Icasa report suggest that the South African telecommunications industry is at a crossroads. The traditional mobile business model is broken, and the "old guard" of the industry must reinvent themselves as digital service companies rather than just connectivity providers.

The next twelve months will likely see:

• Increased Consolidation: Smaller players may struggle to survive the decline in mobile margins, leading to further acquisitions by larger groups.
• Aggressive Fibre Expansion: Competition in the FTTH space will intensify as providers chase the double-digit growth seen in 2025.
• New Monetization Strategies: Telcos will likely push harder into financial services (mobile money), insurance, and content streaming of their own to recoup losses from voice and SMS.
• Regulatory Battles: The proposed OTT "tax" or licensing fees will likely face stiff opposition from global tech giants and digital rights advocates who argue that such costs will eventually be passed on to the consumer.

In conclusion, the USD 635 million "stolen" by WhatsApp is a symbolic figure representing the end of the traditional cellular era in South Africa. As the country moves toward a fibre-first, data-centric future, the struggle between the local infrastructure builders and the global platform giants is only just beginning. The 2025 data serves as a final warning to the industry: adapt to the OTT world, or watch the remaining revenue evaporate into the cloud.