Telecom
Hackers Could Decrypt Your GSM Phone Call
Researchers have discovered a flaw in the GSM standard used by AT&T and T-Mobile that would allow hackers to listen in.
Researchers from BlackBerry at DefCon security conference in Las Vegas, USA, presented an attack that can intercept GSM calls as they’re transmitted over the air and decrypt them to listen back to what was said.
And the vulnerability has been around for decades.
Most mobile calls around the world are made over the Global System for Mobile Communications standard; in the US, GSM underpins any call made over AT&T or T-Mobile’s network.
Regular GSM calls aren’t fully end-to-end encrypted for maximum protection, but they are encrypted at many steps along their path, so random people can’t just tune into phone calls over the air like radio stations.
The researchers found, though, that they can target the encryption algorithms used to protect calls and listen in on basically anything.
“GSM is a well documented and analyzed standard, but it’s an aging standard and it’s had a pretty typical cybersecurity journey,” says Campbell Murray, the global head of delivery for BlackBerry Cybersecurity.
“The weaknesses we found are in any GSM implementation up to 5G. Regardless of which GSM implementation you’re using there is a flaw historically created and engineered that you’re exposing.”
The problem is in the encryption key exchange that establishes a secure connection between a phone and a nearby cell tower every time you initiate a call.
This exchange gives both your device and the tower the keys to unlock the data that is about to be encrypted. In analyzing this interaction, the researchers realized that the way the GSM documentation is written, there are flaws in the error control mechanisms governing how the keys are encoded. This makes the keys vulnerable to a cracking attack.
“It’s a really good example of how the intention is there to create security, but the security engineering process behind that implementation failed.”
As a result, a hacker could set up equipment to intercept call connections in a given area, capture the key exchanges between phones and cellular base stations, digitally record the calls in their unintelligible, encrypted form, crack the keys, and then use them to decrypt the calls.
The findings analyze two of GSM’s proprietary cryptographic algorithms that are widely used in call encryption—A5/1 and A5/3.
The researchers found that they can crack the keys in most implementations of A5/1 within about an hour. For A5/3 the attack is theoretically possible, but it would take many years to actually crack the keys.
“We spent a lot of time looking at the standards and reading the implementations and reverse engineering what the key exchange process looks like,” BlackBerry’s Murray said.
“You can see how people believed that this was a good solution. It’s a really good example of how the intention is there to create security, but the security engineering process behind that implementation failed.”
The researchers emphasize that because GSM is such an old and thoroughly analyzed standard, there are already other known attacks against it that are easier to carry out in practice, like using malicious base stations, often called stingrays, to intercept calls or track a cellphone’s location.
Additional research into the A5 family of ciphers over the years has turned up other flaws as well. And there are ways to configure the key exchange encryption that would make it more difficult for attackers to crack the keys. But Murray says that the theoretical risk always remains.
Short of totally overhauling the GSM encryption scheme, which seems unlikely, the documentation for implementing A5/1 and A5/3 could be revised to make key interception and cracking attacks even more impractical. The researchers say that they are in the early phases of discussing the work with the standards body GSMA.
The trade association said in a statement to WIRED that, “Details have not been submitted to the GSMA under our coordinated vulnerability (CVD) programme. When the technical details are known to the GSMA’s Fraud and Security Group we will be better placed to consider the implications and the necessary mitigation actions.”
Though it may not be that surprising at this point that GSM has security issues, it’s still the cellular protocol used by the vast majority of the world. And as long as it’s around, real call privacy issues remain, too.
MTN Nigeria, in collaboration with ONErpm and Ultima Studios, has announced Ayodeji Benson, popularly known as Ayo Benzi, as the winner of the maiden edition of the Next Afrobeats Star reality show.
L-R: Onyinye Ikenna-Emeka, Chief Marketing Officer, MTN Nigeria; Ayodeji Benson, Winner, Next Afrobeats Star Reality Show (Season 1) and Emamoke Ogoro, General Manager, Brand and Communication, MTN Nigeria, at the grand finale of the Next Afrobeats Star Reality Show (Season 1), held at the Ultima Studios, Lekki, Lagos on Saturday, December 13, 2025.
The grand finale, held on Sunday night at Ultima Studios in Lekki, Lagos, marked the climax of a nationwide talent search that began in September with over 15,000 aspiring musicians.
After weeks of auditions, mentorship, and rigorous training, five finalists – Ayo Benzi, Dave Cash, Kaeko, Somto O’Laker, and Lucky Yay – battled for the top prize in a high-energy showcase of performance and artistry.
At the end of the electrifying contest, Ayo Benzi emerged victorious, securing a ₦150 million music deal. Dave Cash was named first runner-up with ₦100 million, while Kaeko, Somto O’Laker, and Lucky Yay received ₦75 million, ₦50 million, and ₦25 million respectively.
Throughout the season, contestants were mentored by leading Afrobeats producers Sarz, Puffy Tee, P Prime, and Andre Vibez. Benzi, who was part of Puffy Tee’s team, credited the mentorship programme for sharpening his craft and stage presence.
Speaking at the event, Onyinye Ikenna-Emeka, Chief Marketing Officer of MTN Nigeria, said the initiative reflects the company’s commitment to youth empowerment and cultural expression.
“The Next Afrobeats Star platform is about creating real opportunities for young Nigerians and giving their talent the structure, visibility, and support it deserves.
“Afrobeats continues to place Nigeria on the global cultural map, and MTN is proud to be enabling the next generation of artists who will take this sound even further,” she said.
She added that the finale was not just a competition but a celebration of growth and readiness for the global stage.
In his acceptance speech, Ayo Benzi described the victory as a defining moment in his career.
“A big thank you to MTN. From the audition days, the treatment MTN has given us has been amazing. God bless the brand,” he said.
The finale also featured guest performances by Afrobeats stars Iyanya and Bella Shmurda, adding glamour to the night and reinforcing the show’s connection to the wider music ecosystem.
With the successful conclusion of the season, MTN Nigeria and its partners reaffirmed their role in championing youth ambition, supporting creative industries, and shaping the future of Nigerian music through platforms that turn potential into opportunity.
T2, formerly known as 9mobile, is under investigation by the Nigerian Communications Commission (NCC) in Benue State for an undisclosed incident disrupting USSD, SMS, voice, and data services across nine local government areas.
T2
The affected areas include Ado, Agatu, Gwer East, Gwer West, Konshisha, Obi, Ohimini, Okpokwu, and Otukpo, as detailed in an advisory on the NCC Major Outages Portal, which tracks significant disruptions reported by Mobile Network Operators (MNOs) and Internet Service Providers (ISPs).
Neither T2 nor its public relations firm, Chain Reactions, has responded to inquiries on the outage’s cause or restoration efforts as of this report.
The NCC’s continued reference to the operator as 9mobile, months after its public rebranding to T2 in August 2025, has sparked questions about whether the name change was formally notified to the regulator.
This probe aligns with NCC mandates requiring operators to disclose major outages, their impacts, and timelines for fixes, with compensation obligatory for disruptions exceeding 24 hours under the Consumer Code of Practice Regulations.
Industry watchers note that such incidents, often linked to fibre cuts, power failures, or infrastructure faults, underscore ongoing challenges in Nigeria’s telecoms sector, particularly amid T2’s subscriber losses post-rebrand. NCC vows transparency via its portal to hold operators accountable and protect consumers.
Telecom
NCC Unveils Draft 5-Year Spectrum Roadmap, 60 GHz License-Exempt Guidelines to Boost Broadband, Innovation
Nigerian Communications Commission (NCC) has unveiled two pivotal regulatory draft documents aimed at reshaping Nigeria’s communications sector over the next five years and fast-tracking deployment of ultra-high-speed wireless technologies.
NCC
In a public notice dated December 19, 2025, and issued pursuant to its mandate under the Nigerian Communications Act (NCA) 2003, the Commission published the Draft 5-Year Spectrum Roadmap for the Communications Sector (2025–2030) and Draft Guidelines for the Use of the 60 GHz License-Exempt Band for Multi-Gigabit Wireless Systems.
Both documents are accessible on the NCC website for stakeholder review, with the roadmap outlining strategic spectrum planning, allocation, and management to optimise utilisation, support emerging technologies like 5G and IoT, expand broadband access, and align with global best practices.
The Spectrum Roadmap emphasises four core pillars: bridging the digital divide through low-band spectrum and satellite services, attracting investments via flexible licensing models, enhancing service quality with mid-band optimisation, and fostering innovation in areas such as direct-to-device connectivity and secondary spectrum trading.
It sets ambitious targets including universal 4G coverage nationwide, 50 per cent 5G penetration in state capitals, and average broadband speeds of 100 Mbps by 2030, while addressing rising data demand through band refarming and efficient management.
Complementing this, the 60 GHz Guidelines establish a license-exempt framework for the 57–66 GHz band, enabling multi-gigabit speeds up to 10 Gbps for short-range applications like WiGig, fixed wireless access, enterprise connectivity, urban broadband, and backhaul solutions.
The rules mandate NCC type approval for equipment, site registration for outdoor use, and interference mitigation measures, while prohibiting wide-area networks to safeguard primary users.
In line with Section 58 of the NCA 2003, NCC invites comments from industry operators, equipment manufacturers, consumer groups, and the public, with submissions due by Friday, January 16, 2025, via email to [email protected], [email protected], and [email protected].
The notice, signed by Mrs Nnenna Ukoha, Head of Public Affairs, stresses that stakeholder inputs will refine the frameworks to drive innovation, investment, competition, and sustainable growth in Nigeria’s telecoms ecosystem.
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