Cellusys Blog

U Mobile blocks 265 million scam attempts with Cellusys network-level scam protection U Mobile blocks 265 million scam attempts with Cellusys network-level scam protection U Mobile blocks 265 million scam attempts with Cellusys network-level scam protection
December 29, 2025

U Mobile blocks 265 million scam attempts with Cellusys network-level scam protection

U Mobile, Malaysia’s first telco to deliver network-level scam protection, successfully blocks over 265 million attempts with Cellusys Kuala Lumpur, 29 December 2025 – U Mobile, Malaysia’s newest 5G network provider, is the first telco in the country to enable full-scale scam protection across its entire network. Operating in full scale since February 2025, the… View Article
Cellusys: Generative AI Is Redefining Telecom Security, but Without Signalling Intelligence, Governance and Real-Time Visibility, It Increases Risk Cellusys: Generative AI Is Redefining Telecom Security, but Without Signalling Intelligence, Governance and Real-Time Visibility, It Increases Risk Cellusys: Generative AI Is Redefining Telecom Security, but Without Signalling Intelligence, Governance and Real-Time Visibility, It Increases Risk
December 17, 2025

Cellusys: Generative AI Is Redefining Telecom Security, but Without Signalling Intelligence, Governance and Real-Time Visibility, It Increases Risk

Dublin, Ireland – 17 December 2025 – Cellusys, a global specialist in telecom signalling security, has contributed to a major new white paper published by the Global Cybersecurity Forum (GCF) in collaboration with The Saudi Telecom Company (stc), exploring how Generative AI can enhance the protection of next generation telecom networks. The white paper, Enhancing the… View Article
Cellusys Recognised as Champion for Signalling Security and Roaming Analytics in Kaleido Intelligence 2025 Vendor Hub Cellusys Recognised as Champion for Signalling Security and Roaming Analytics in Kaleido Intelligence 2025 Vendor Hub Cellusys Recognised as Champion for Signalling Security and Roaming Analytics in Kaleido Intelligence 2025 Vendor Hub
November 25, 2025

Cellusys Recognised as Champion for Signalling Security and Roaming Analytics in Kaleido Intelligence 2025 Vendor Hub

Dublin, Ireland – 26 November 2025 – Cellusys has been recognised as a Champion Vendor in both Signalling Security and Roaming Analytics & Quality Management in Kaleido Intelligence’s Roaming Vendor Hub 2025, following a comprehensive evaluation of 80 vendors and over 185 product offerings across the global roaming ecosystem (full report and release available at… View Article
Cellusys Ranked #1 Vendor for Steering of Roaming for the Third Consecutive Year in Kaleido Intelligence 2025 Assessment Cellusys Ranked #1 Vendor for Steering of Roaming for the Third Consecutive Year in Kaleido Intelligence 2025 Assessment Cellusys Ranked #1 Vendor for Steering of Roaming for the Third Consecutive Year in Kaleido Intelligence 2025 Assessment
November 19, 2025

Cellusys Ranked #1 Vendor for Steering of Roaming for the Third Consecutive Year in Kaleido Intelligence 2025 Assessment

Dublin, Ireland – 19 November 2025 – Cellusys has been ranked the #1 vendor for Steering of Roaming (SoR) for the third consecutive year in Kaleido Intelligence’s Roaming Vendor Hub 2025 (full report and release available at Kaleido Intelligence). Kaleido’s Roaming Vendor Hub is the most detailed competitive intelligence assessment in the roaming ecosystem, covering 80… View Article
Cellusys & Simba Announce Steering of Roaming Partnership Cellusys & Simba Announce Steering of Roaming Partnership Cellusys & Simba Announce Steering of Roaming Partnership
November 17, 2025

Cellusys & Simba Announce Steering of Roaming Partnership

Cellusys Steering of Roaming (SoR) service, empowers Simba to automatically respond to network dynamics and gain visibility and control over roaming profitability and quality, enabling an unparalleled roaming customer experience for their customers. Singapore & Dublin, Ireland – November 17th 2025 Today, Cellusys and Simba are delighted to announce their partnership, enabling Simba to avail… View Article
Drei Austria and Cellusys Deliver World’s First Steering of Roaming for 5G Standalone Drei Austria and Cellusys Deliver World’s First Steering of Roaming for 5G Standalone Drei Austria and Cellusys Deliver World’s First Steering of Roaming for 5G Standalone
November 13, 2025

Drei Austria and Cellusys Deliver World’s First Steering of Roaming for 5G Standalone

Drei Austria, a leading mobile operator, and Cellusys, the #1 provider of roaming and mobile security solutions, have achieved a world first: successfully demonstrating Steering of Roaming for 5G Standalone (SA) networks. This milestone proves that both companies are at the forefront of roaming innovation, going beyond current standards and vendor readiness to make 5G… View Article
Arelion and Cellusys partner to deliver suite of hosted roaming services Arelion and Cellusys partner to deliver suite of hosted roaming services Arelion and Cellusys partner to deliver suite of hosted roaming services
October 14, 2025

Arelion and Cellusys partner to deliver suite of hosted roaming services

Stockholm, October 14, 2025 — Arelion today announced a partnership with Cellusys, the industry leader in roaming steering, fraud and security and analytics solutions for mobile operators, to bring a comprehensive suite of hosted roaming Value Added Services (VAS) to operators worldwide. Delivered via Arelion’s global IPX and backbone, the joint solution gives operators a… View Article
Travel eSIMs: the blind spot in MNOs’ roaming strategies Travel eSIMs: the blind spot in MNOs’ roaming strategies Travel eSIMs: the blind spot in MNOs’ roaming strategies
August 15, 2025

Travel eSIMs: the blind spot in MNOs’ roaming strategies

What are travel eSIMs? A travel eSIM allows international travellers to buy data connectivity from alternative roaming providers instead of their home operators, without the need for physical SIM cards. Unlike traditional local SIM cards, travel eSIMs use the consumer eSIM standard. The eSIM is embedded directly into compatible devices and can be remotely loaded… View Article
Don’t Fear the Cloud: Virtualising the STP Without Regret Don’t Fear the Cloud: Virtualising the STP Without Regret Don’t Fear the Cloud: Virtualising the STP Without Regret
July 30, 2025

Don’t Fear the Cloud: Virtualising the STP Without Regret

About 25 years ago in Telecom an exciting and yet intimidating new suite of protocols was gaining momentum called SIGTRAN. Operators could get away from cumbersome TDM, AnnexA, ATM and virtualise the SS7 transmission over an IP protocol called SCTP. The potential benefits were huge but the unknown elements such as building out robust IP… View Article
Travel eSIMs Are Eroding Roaming Revenues: How MNOs Can Respond Travel eSIMs Are Eroding Roaming Revenues: How MNOs Can Respond Travel eSIMs Are Eroding Roaming Revenues: How MNOs Can Respond
April 30, 2025

Travel eSIMs Are Eroding Roaming Revenues: How MNOs Can Respond

Travel eSIMs are rapidly capturing roaming traffic — and revenue — from MNOs. Without fast action, operators risk losing control of both outbound and inbound roamers. Here’s how to protect your business and turn the tide. Outbound: Keep Your Subscribers Roaming on Your Network The Problem:Subscribers are switching to TravelSIMs when they travel, fearing high… View Article
Cellusys Acquires Ribbon’s DSC Product Cellusys Acquires Ribbon’s DSC Product Cellusys Acquires Ribbon’s DSC Product
April 30, 2025

Cellusys Acquires Ribbon’s DSC Product

Cellusys to Support Ribbon DSC, STP, DRA, and SP2000 Products We are pleased to share an important update for mobile operators and signalling engineers who rely on Ribbon Communications’ signalling products. As of April 2025, Cellusys is the official provider of engineering, professional services, and Tier 3 support for Ribbon’s Diameter Signalling Controller (DSC), Signalling… View Article
Roaming Quality Matters More Than Ever — Here’s How to Manage It Roaming Quality Matters More Than Ever — Here’s How to Manage It Roaming Quality Matters More Than Ever — Here’s How to Manage It
April 23, 2025

Roaming Quality Matters More Than Ever — Here’s How to Manage It

We’ve spoken before about how automation can improve roaming quality. But there’s another important angle that deserves a closer look: how operators can actively steer subscribers based on quality, not just price. Roaming quality has never mattered more — and for some customer segments, it’s now business-critical.Enterprise customers, IoT users, and VIP roamers are increasingly… View Article
What we’re seeing in 5G SA roaming — and it’s worse than we thought What we’re seeing in 5G SA roaming — and it’s worse than we thought What we’re seeing in 5G SA roaming — and it’s worse than we thought
April 16, 2025

What we’re seeing in 5G SA roaming — and it’s worse than we thought

When 3GPP introduced the Steering of Roaming (SoR) function for 5G standalone (SA) networks in specification 29.550, it represented a step forward. Unlike SS7 and Diameter, where steering was largely managed independently, SoR in 5G SA is a defined function inside the core network itself. The principle is simple: a preferred PLMN list is created… View Article
Securing the Future: How Stacuity and Cellusys are Powering Mission-Critical Applications Securing the Future: How Stacuity and Cellusys are Powering Mission-Critical Applications Securing the Future: How Stacuity and Cellusys are Powering Mission-Critical Applications
March 26, 2025

Securing the Future: How Stacuity and Cellusys are Powering Mission-Critical Applications

In a world where connectivity is the foundation of modern infrastructure, security and resilience are non-negotiable. Nowhere is this more evident than in mission-critical applications – think power grids, medical devices, autonomous vehicles, airports, and beyond – where even the smallest lapse in connectivity or security could have far-reaching consequences. That’s why the partnership between… View Article
MWC 25 Roundup: 5G, AI, Open Gateway, Security, eSIMs, MVNOs MWC 25 Roundup: 5G, AI, Open Gateway, Security, eSIMs, MVNOs MWC 25 Roundup: 5G, AI, Open Gateway, Security, eSIMs, MVNOs
March 6, 2025

MWC 25 Roundup: 5G, AI, Open Gateway, Security, eSIMs, MVNOs

We’ve wrapped up another MWC, and it’s been a great week of meeting interesting people, exploring new innovations, and observing the latest trends in the mobile industry – many of which we covered in our daily recaps. If you’re short on time, here’s a summary of the key areas we tracked: Thanks to Tony and… View Article
MWC: Day 2 Recap, Day 3 Watchlist MWC: Day 2 Recap, Day 3 Watchlist MWC: Day 2 Recap, Day 3 Watchlist
March 5, 2025

MWC: Day 2 Recap, Day 3 Watchlist

Open Gateway and APIs were a key focus today, but the conversation often felt more about potential than practical implementation. Meanwhile, Security emerged as a major theme, with real concerns about evolving threats and the need for stronger defences. Many thanks again to Tony and Luanna, who’ve been attending talks I couldn’t make it to…. View Article
MWC Day 1 Recap, Day 2 Watchlist MWC Day 1 Recap, Day 2 Watchlist MWC Day 1 Recap, Day 2 Watchlist
March 3, 2025

MWC Day 1 Recap, Day 2 Watchlist

AI dominated Day 1, but is it real innovation or just another buzzword? 5G was also in focus, though discussions often strayed from monetisation, leaving key questions about ROI unanswered.. A big thank you to Tony and Luanna, who’ve been attending talks I couldn’t make it to – keeping me up to date, sharing insights,… View Article
Meet Cellusys at MWC Barcelona: 5G Roaming, AI-Powered Security & Voice Fraud Prevention Meet Cellusys at MWC Barcelona: 5G Roaming, AI-Powered Security & Voice Fraud Prevention Meet Cellusys at MWC Barcelona: 5G Roaming, AI-Powered Security & Voice Fraud Prevention
March 2, 2025

Meet Cellusys at MWC Barcelona: 5G Roaming, AI-Powered Security & Voice Fraud Prevention

From March 3rd to 6th, 2025, the world’s largest and most influential connectivity event, Mobile World Congress (MWC), returns to the vibrant city of Barcelona. Industry leaders, tech innovators, and visionaries from across the globe will gather once again to shape the future of mobile technology, explore groundbreaking advancements, and foster meaningful collaborations. MWC isn’t… View Article