Telecom
How NCC Stopped $3Bn Call Masking Revenue Fraud In Nigeria
The masking of foreign calls with local phone numbers was illegal, a security risk and also a threat to the revenue base of major mobile network operators (MNOs) whose networks were bypassed for such calls.
According to Leadership investigation revealed that call masking or refiling is the practice of cloning a local telephone number in place of an international number and vice versa with the intention of misconstruing the network that the call was a local call just to shortchanging the telecom operator and the government of revenue due it.
According to the executive vice chairman, Nigerian Communications Commission (NCC), Professor Umaru Danbatta, “SIM boxing or Interconnect Bypass Fraud (IBF) is one of the most prevalent frauds in the telecom industry today and it is estimated to be costing the industry $3 billion in lost revenue.”
Danbatta described call masking as a phenomenon whereby an international call is masked to appear as a local call on any GSM network in Nigeria while SIM Boxing on the other hand refers to electronic boxes or devices with multiple SIMs that have the capacity to terminate calls at local interconnect rates. He said SIM Boxing was observed to have started at the time the Commission decided to review international termination rates from N 3.90/ min. to N24.40/ min. for international inbound traffic which provided an opportunity for technology manipulators to terminate calls at N 3. 90/ min. and cart away the difference thereby cutting the revenue meant for the Operators and by implication the government. A SIM box has capacity to receive and transmit calls undetected.
“However, the challenge is that these SIM boxes are never type-approved by the Commission, a clear indication that they are being used illegally in the country”, the NCC boss stated then. To drive home the point that the Commission was serious about flushing the twin evils out of the industry, Professor Danbatta quickly vide a letter with Ref: TSNI/GEN/VOL.4/115 dated July 19, 2017 directed relevant licencees to ensure the cessation of call masking or refiling activity on their respective networks. The deadline for compliance was July 28, 2017. Furthermore, on August 3, 2017, at a stakeholders meeting organized by the Commission in which the affected companies participated, it was resolved that a comprehensive investigation would be carried out by the NCC to determine the companies/licences involved in the illegal act.
All the licences were warned to desist from this practice. It was also agreed that identified culprits would be sanctioned as part of measures to forestall the negative impact of this incidence on national security. After months of thorough investigation, the telecom regulator in a letter dated January 12, 2018 signed by Yetunde Akinloye, head, legal and regulatory services and Efosa Idehen, head, compliance monitoring and enforcement on behalf of the executive vice chairman/CEO, NCC, issued the Notice of Intention to Suspend licence pursuant to Section 45 (1) and (3) of the Nigerian Communications Act of some culprits found wanting. NCC gave notice of its intention to suspend the interconnect exchange licences granted to six telecommunications clearinghouses over the unethical practice of allowing call masking and call refilling emanate from their facilities.
The companies Medallion Communications Limited, Interconnect Clearinghouse Nigeria Limited, Niconnx Communication Limited, Breeze Micro Limited, Solid Interconnectivity and Exchange Telecommunications Limited and they were given p to January 31, 2018 to state reasons why the regulator should not suspend their licences. According to the NCC’s letter, ““having carefully analysed all the relevant data collected in the course of its investigation activities, the Commission has established a direct and indirect evidence against your company in the illegal and unwholesome activity of call masking and refiling. “Consequently, the Commission, pursuant to Section 45 (1 and (3) of the Nigerian Communications Act, 2003 hereby gives you Notice of its Intention to suspend Interconnect Exchange Licence granted to your company due to your involvement in call masking and refiling and your failure to rectify the breach, despite repeated interventions by the Commission. You are therefore required to state reasons why the Commission should not suspend the said licence. We expected to receive your response on or before January 31, 2018” the letter read. Nearly a month later, NCC handed various levels of sanctions to telecom clearing houses and network providers implicated in the high incidence of call-masking, call-refiling and SIM-Boxing. NCC conducted a painstaking investigation process which included collaboration with the Office of the National Security Adviser (NSA) and the Department of State Services.
Among the various ranges of sanctions were the suspension of the Interconnect Clearinghouse License issued to Medallion Communications Limited for a period of 90 days, in the first instance; Issuance of a strong warning to Interconnect Clearinghouse Nigeria Limited; disconnection of Information Connectivity Solutions Limited (ICSL) and Solid Interconnectivity Services Limited from all networks, until they regularize their operations. Others were: Issuance of letters to Exchange Telecoms Limited, NiconnX Limited and Breeze Micro Limited, cautioning them against engaging in the fraudulent practice; and barring of over 750,000 numbers assigned to several Private Network Links (PNL) and Local Exchange Operator (LEO) licensees, which number ranges were found to have been utilized for the practice.
The Commission said the sanctioned entities were found to be directly and indirectly complicit in several infractions, including, covertly allowing organisations with expired licences to transit calls, failure to undertake due diligence on parties seeking to interconnect, deliberately turning a blind eye to masking infractions by interconnect partners, and using a licence issued to another organisation to bring-in and terminate international calls which were masked as local calls to other operators.
During the investigation, it was found that over 750,000 individual numbers across the nation made up of about 31 number ranges were used for the fraud. NCC barred those numbers which belonged to Vezeti Communications Services Limited, Voix Networks Limited, Mobitel Limited, Peace Global Satellite Communications Limited, ABG Communications Limited, Vodacom Business Africa (Nigeria) Limited, Swift Telephone Networks Limited, QVODA Telecoms Limited, Wireless Telecoms Limited and Emcatel Networks Limited. The Commission found that some of them were terminating millions of minutes, whereas they only have very few active customers. Following that, NCC began the second stage of investigation which focused on the Mobile Network Operators and other persons involved in SIM-Boxing. The aim of the Commission was to completely stamp out the fraudulent practice in the overall interest of all Nigerians. To this end, NCC in 2018 introduced a new technology which nipped in the bud, menace of call masking and call refiling
As the revolutionary Airtel Spam AI Alert Service rolls out across Airtel Africa’s 14 operating countries, Airtel Nigeria CEO, Dinesh Balsingh, has elaborated on the unprecedented benefits and operating principles guiding the Spam Alert Service.
Designed to enhance user safety, this pioneering AI-driven product provides real-time defense against spam and fraudulent SMS messages, making it a gamechanger for mobile security across the continent.
The Airtel AI Spam Alert Service, which is engineered to automatically detect and label suspicious SMS messages as “Suspected SPAM” without requiring any user action or additional apps, leverages a robust AI algorithm that analyzes over 250 parameters.
These parameters includee sender behavior, message frequency, message geographical distribution, and unusual activity patterns. Impressively, the service completes this process under just two milliseconds, offering near-instantaneous alerts while maintaining the privacy of user data by not reading message content.
Commenting on the breakthrough service, Dinesh Balsingh, CEO of Airtel Nigeria, stated: “Nigeria is not just a critical market for us—it’s a leader in digital adoption within the continent. Our AI Spam Alert Service reflects our dedication to safeguarding our customers from the growing threat of SMS fraud.
“As the first of its kind in Africa, it addresses a fundamental issue of trust and security, which is paramount to our digital ecosystem. We’re proud to offer this service to Nigerians and extend it across our African footprint.”
Following its successful deployment in Nigeria, the Spam Alert Service has now launched in Tanzania and Kenya and is set to cover Airtel’s entire African operations. The service’s automatic activation for all Airtel customers, across both smartphones and feature phones, ensures maximum reach and accessibility.
Early feedback from subscribers has been overwhelmingly positive, with users praising the AI’s efficiency in flagging potentially harmful messages without interfering with their everyday communication.
By pioneering this AI-based spam detection technology, Airtel Africa demonstrates its commitment to leveraging cutting-edge innovation to resolve critical issues facing its subscribers. The AI Spam Alert Service not only protects users but also sets a new benchmark for mobile security standards in the region.
“Our goal is to build a safer digital environment for our users,” added Balsingh. “This innovation is part of our broader strategy to incorporate advanced technologies that address real challenges while enhancing the overall customer experience.”
As Africa stands at the point of a profound transformation, the imperative for greater intra-continental cooperation has never been clearer. The path to shared prosperity depends not on the progress of individual nations but on the collective strength of our commitments.
Central to this vision is the relationship between South Africa and Nigeria, two of the continent’s largest economies, and the institutions that serve as bridges between them.
It was an honour for MTN Group to host Minister Parks Tau (SA Minister of Trade Industry and Competition) and his delegation at our Headquarters in Johannesburg. At a time when global uncertainties are reshaping trade and technology, Africa must respond not in isolation, but in solidarity.
As MTN, we see it as our duty to serve as an economic diplomatic bridge between Nigeria and South Africa — driving growth, fostering inclusion, and unlocking opportunity for the Africa’s shared prosperity.
MTN’s journey exemplifies what is possible when two great nations collaborate. As Nigeria’s largest South African investor, MTN has long viewed its presence not simply as a commercial venture but as a platform for inclusive development.
Since commencing operations in Nigeria in 2001, we have invested more than US$10 billion in the country’s digital infrastructure.
Today, MTN Nigeria serves over 80 million subscribers, employs thousands directly, and supports hundreds of thousands of livelihoods across its extended value chain.
Yet, while the economic footprint is significant, our greatest source of pride lies in the social and developmental outcomes accompanying this investment, expanded access to connectivity, enhanced financial inclusion, and the empowerment of individuals and enterprises through digital technologies.
Still, the operating environment remains complex. Macroeconomic challenges in Nigeria, including currency depreciation, inflation, and constraints in accessing foreign exchange, have placed pressure on business continuity and investor confidence.
Despite these difficulties, MTN remains firmly committed to its business case and its long-term presence in Nigeria, underpinned by a belief in the country’s enduring potential and strategic importance to the continent.
However, for South Africa and Nigeria to truly unlock their bilateral potential, a number of long-standing issues require resolution. The upcoming South Africa–Nigeria Trade and Investment Summit, to be held in Abuja later this year, presents a unique opportunity to address these concerns.
The Summit serves not merely as a diplomatic engagement, but as a catalyst for policy reform, reciprocal market access, and institutional dialogue. Importantly, it should reinforce the private sector’s role in shaping practical, actionable solutions that support cross-border trade and investment.
The African Continental Free Trade Area (AfCFTA) offers a historic platform to actualise these ambitions. Yet its success will depend as much on infrastructure and digital connectivity as it will on tariff liberalisation or regulatory harmonisation.
As a pan-African operator, MTN is investing heavily in the digital foundations of AfCFTA, facilitating seamless mobile communication, enabling digital payments, and building platforms for cross-border entrepreneurship.
We also believe that integration must extend beyond economic frameworks to include cultural exchange and people-to-people engagement. One such initiative is our MTN Media Innovation Programme, which brings emerging Nigerian media professionals to South Africa for immersive learning.
Through programmes like these, we aim to cultivate not only knowledge and skills, but also enduring bonds between our nations’ future leaders.
Nigeria’s telecommunications sector witnessed a notable decline in internet users following a 50 per cent tariff hike on voice, data, and SMS services implemented in January 2025.
The Nigerian Communications Commission (NCC) made this known in industry statistics on its website.
According to the report, the industry lost approximately one million internet users in February, with the user base shrinking from 142.16 million to 141.25 million.
It said although a slight recovery was observed in March, with the figure rising to 142.05 million, the sector’s data consumption patterns were significantly impacted.
The NCC data showed a 12 per cent decline in monthly data consumption in February, dropping to 893.06 petabytes from January’s record high of one exabyte.
It, however, said a marginal rebound was recorded in March, with data usage increasing by 11.5 per cent to 995.88 petabytes.
Despite this modest recovery, the report said consumption levels remained slightly below the January peak, suggesting that subscribers continued to exhibit caution in their usage habits due to the increased tariffs.
Meanwhile, the telecom industry demonstrated resilience in other areas, with operators adding 3.39 million new telephone users between January and March.
This growth propelled the total active lines from 169.32 million to 172.71 million, subsequently boosting Nigeria’s teledensity from 78.10 per cent to 79.67 per cent during the same period.
In terms of market dynamics, Mobile Network Operators (MNOs) maintained their dominance in the internet market.
MTN Nigeria led with 75.62 million users, followed by Airtel Nigeria with 48.8 million, Globacom with 15.37 million, and 9mobile with 1.75 million.
MTN also retained its market lead in active telephone lines with 90.5 million subscribers, representing a 52.48 per cent market share, while Airtel followed with 58.3 million users (33.78 per cent), Globacom with 20.7 million (12 per cent), and 9mobile with 2.9 million (1.72 per cent).
The latest industry figures underscore the complexities facing Nigeria’s telecom sector as operators navigate economic pressures and evolving consumer behaviours.
On porting activities, the NCC report noted that Nigeria’s fourth mobile network operator, 9mobile, had continued to experience a decline in its subscriber base, with a total of 5809 customers porting out of its network both in February and March.
The report showed that other operators recorded insignificant outgoing porting numbers compared to 9mobile.
It showed that MTN lost 647 customers, Airtel recorded 695 outgoing portings, Globacom recorded 771, while 9mobile lost 5808 in both February and March.
In terms of incoming porting, MTN gained the most customers from other operators, with 4855 subscribers joining its network in February and March, the report revealed.
It stated that Airtel recorded 2084 incoming porting, while Globacom gained 1007 customers in both months.
The NCC added that, meanwhile, 9mobile recorded only three incoming porting for both months.
According to the NCC report on incoming and outgoing porting activities of mobile network operators, a total of 7922 subscribers moved from one network to another in February and March.
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