South Africa’s telecom sector faces a pivotal transformation as the Independent Communications Authority of South Africa (Icasa) advances plans to mandate open-access infrastructure sharing, targeting dominant players like Vodacom Group Ltd (JSE: VOD) and MTN Group Ltd (JSE: MTN) to unbundle network assets and allow competitors equitable access to towers, fiber, and spectrum by 2027. Announced amid rising consumer pressure over data costs and network congestion, the policy aims to stimulate competition in a market where the top two operators control over 70% of mobile subscriptions, potentially reshaping capital allocation, margin structures, and investment returns across the sector while addressing long-standing affordability barriers for low-income users.
The Bottom Line
- Vodacom and MTN could see combined EBITDA pressure of 8-12% by FY2028 if forced to share infrastructure at regulated rates, based on current capex intensity and wholesale pricing models.
- Smaller players like Telkom SA SOC Ltd (JSE: TKG) and Rain may gain 3-5 percentage points in market share within 24 months of mandated access, lowering average revenue per user (ARPU) decline across the industry.
- Infrastructure REITs and tower companies such as American Tower Corporation (NYSE: AMT) and local operator Helios Towers plc (LSE: HTWS) stand to benefit from increased tenancy rates, with South Africa tower tenancy ratios potentially rising from 1.4x to 1.8x by 2029.
Icasa’s Open-Access Mandate: A Structural Shift Beyond Price Caps
Unlike previous regulatory interventions focused solely on retail price ceilings or asymmetric termination rates, Icasa’s latest framework targets the physical and logical layers of network infrastructure. The authority’s draft regulations, published in March 2026 after a 14-month consultation, require operators with Significant Market Power (SMP) to provide non-discriminatory access to passive infrastructure—including ducts, poles, tower sites, and backhaul fiber—at cost-oriented rates determined by a new benchmarking methodology. This marks a departure from the 2022 Mobile Broadband Services Regulations, which failed to meaningfully reduce data prices despite a 15% average tariff cut, as operators offset losses through premium bundle upsells and data throttling during peak hours.
The move follows mounting evidence that South Africa’s mobile data remains among the most expensive in Africa relative to income. According to the Alliance for Affordable Internet’s 2025 report, 1GB of mobile data costs 3.2% of average monthly income in South Africa, compared to 1.8% in Kenya and 0.9% in Ghana. With smartphone penetration at 82% but monthly active data users stagnating at 68% of the population, regulators argue that network exclusivity—not spectrum scarcity—is the primary barrier to inclusion.
Financial Implications: Margin Compression vs. Volume Upside
For Vodacom and MTN, the financial calculus hinges on whether mandated access rates will approximate true economic cost or include a reasonable return on deployed capital. Analysts at Absa Capital estimate that if access prices are set at 60% of retail equivalent—a midpoint between pure cost recovery and market-based wholesale—Vodacom’s South African EBITDA margin could contract from 38.5% in FY2025 to 34.1% by FY2027, assuming no offsetting efficiencies. MTN’s SA operations, which ran at 41.2% EBITDA margin in FY2025, face similar downside risk to 36.8%.
However, both companies may partially mitigate losses through increased tenancy on their own infrastructure. Vodacom reported 42,100 tower sites in South Africa at FY2025 end, with an average tenancy ratio of 1.3x. If mandated access drives tenancy to 1.6x—as seen in Nigeria after similar reforms—tower-related revenue could contribute an additional ZAR 1.8 billion annually by 2028, offsetting roughly 40% of projected EBITDA pressure. MTN’s 38,500 SA towers could yield ZAR 1.5 billion in incremental tower income under the same scenario.
Competitive Realignment: Telkom, Rain, and the Wholesale Opportunity
Telkom SA, traditionally disadvantaged in mobile scale but possessing extensive fixed fiber and duct networks, is positioned to become both a beneficiary and a provider under the new regime. With 145,000 km of deployed fiber—more than double Vodacom’s SA footprint—Telkom could leverage its fixed assets to offer wholesale backhaul and dark fiber services. The company’s FY2025 wholesale revenue stood at ZAR 3.1 billion (18% of total); Icasa’s mandate could lift this to ZAR 4.7 billion by FY2029 if access pricing enables viable wholesale margins.
Rain, the LTE-only challenger that pioneered uncapped 5G in Africa, stands to gain most immediately. By shedding the necessitate to duplicate tower builds in urban centers, Rain could redirect its ZAR 2.3 billion FY2025 capex toward spectrum acquisition and customer acquisition costs. Analysts at Stanlib project Rain’s Gauteng population coverage could rise from 65% to 89% by end-2026 if it secures mandated access to 70% of Vodacom and MTN tower sites in Johannesburg and Pretoria, potentially adding 2.1 million new subscribers and lifting revenue from ZAR 4.9 billion to ZAR 7.2 billion.
Market Bridging: Telecoms, Inflation, and the Broader Economy
The telecommunications sector contributes approximately 2.8% to South Africa’s GDP and employs over 120,000 people directly. Lower data costs have measurable macroeconomic effects: a 10% reduction in mobile broadband prices correlates with a 0.4% increase in small business productivity and a 0.7% rise in online retail transaction volume, according to a 2024 study by the University of Cape Town’s Development Policy Research Unit. With consumer inflation at 5.1% in Q1 2026 and data services comprising 4.3% of the CPI basket, sustained price relief could shave 0.2 percentage points off headline inflation by 2027.
Supply chain implications are equally significant. Tower manufacturers like South Africa-based PPC Ltd (JSE: PPC) and civil contractors such as Murray & Roberts Holdings Ltd (JSE: MUR) stand to benefit from increased tenancy-driven upgrades. PPC’s concrete pole division, which supplied 38% of Vodacom’s new tower foundations in FY2025, could see order volumes rise 22% by 2028 if tenancy-driven reinforcement projects accelerate. Conversely, reduced duplicate build demand may pressure greenfield tower suppliers, though net employment effects remain neutral as maintenance and tenancy management roles expand.
Expert Perspectives: Investor Sentiment and Regulatory Risk
“The real test isn’t whether Icasa can mandate access—it’s whether they can set rates that allow incumbents to maintain a reasonable return while enabling genuine competition. Get this wrong, and you deter the very investment needed to expand coverage to underserved areas.”
“From an investor standpoint, we’re modeling this as a regulated utility transition. The winners won’t be the traditional mobile operators but the infrastructure owners who can monetize shared assets—think towercos, fiber REITs, and neutral host providers.”
Both experts emphasize regulatory execution risk. Icasa’s ability to enforce non-discrimination, prevent gaming through excessive ancillary charges, and adapt to technological shifts (e.g., open RAN, network slicing) will determine whether the policy achieves its dual goals of competition and investment continuity. Past delays in spectrum auctions and inconsistent enforcement of quality-of-service rules have eroded operator confidence, though the authority’s recent partnership with the Competition Commission on market inquiries signals a more coordinated approach.
The Bottom Line: A Regulatory Inflection Point with Measurable Stakes
South Africa’s telecom reform represents one of the most consequential structural interventions in Africa’s largest telecom market since the 2005 licensing round. While Vodacom and MTN face near-term margin pressure, the policy’s success will be measured not in quarterly earnings but in long-term metrics: data price elasticity, rural coverage expansion, and the emergence of a viable wholesale layer. For investors, the shift favors asset-light models and infrastructure providers over integrated operators—a trend already evident in the 22% premium tower REITs like Helios Towers command over traditional telcos on EV/EBITDA multiples. As implementation begins in earnest later this year, the true test will be whether open access fosters sustainable competition without undermining the incentives to build next-generation networks in South Africa’s most challenging terrains.
*Disclaimer: The information provided in this article is for educational and informational purposes only and does not constitute financial advice.*
