Cellusys
Cellusys is a Dublin-based B2B software vendor founded in 2004 that provides roaming management, signalling security, and analytics solutions to mobile network operators worldwide, serving 192 networks and 2.24 billion subscribers across SS7, Diameter, and 5G environments via on-premises and managed-service delivery.
- Company typePrivate
- Founded2004
- HeadquartersDublin, Ireland
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What Cellusys does
Cellusys is a Dublin-headquartered, privately held B2B software vendor founded in 2004 that provides roaming management, signalling security, and analytics solutions to mobile network operators worldwide. Its platform is built on a virtualised signalling routing infrastructure that supports SS7, Diameter, GTP, SIP, HTTP/2, and SMS in a unified architecture, with modules spanning Steering of Roaming, Signalling Firewall, Voice Firewall, SMS Firewall and Anti-Phishing, Signalling Transfer Point (STP), Diameter Routing Agent (DRA), Service Communication Proxy (SCP), Security Edge Protection Proxy (SEPP), OTA SIM management, Entitlement Server, Roam Insight analytics, and a suite of standardised Network APIs (Silent Authentication, Device Location, SIM Swap Detection, Number Verification, Fraud & Risk Signals). The product portfolio is organised into four solution categories — Roaming, Fraud & Security, Signalling Core, and Analytics & Monitoring — supplemented by Network APIs and Device Management, and is delivered on-premises or as a managed service via partnerships with IPX carriers such as Arelion, Syniverse, and BICS.
Cellusys monetises primarily through enterprise software licences and recurring subscriptions, complemented by managed services (hosted VAS delivery over partner IPX networks) and professional services for deployment, configuration, and operational handover. The customer base is concentrated in the global mobile operator segment, with 192 networks and 2.24 billion subscribers served, alongside MVNO/MVNE and API-aggregator segments; named enterprise customers include Vodafone, U Mobile, Drei Austria, Simba, and ice. In April 2025 the company expanded its signalling routing footprint by acquiring Ribbon Communications' DSC product line (including STP, DRA, and SP2000), and the company has formed strategic alliances with BICS, CSG, Stacuity, Yaana, and Arelion to address 5G SA migration, fraud and scam protection, and Network API monetisation. The firm claims zero customer losses over 20+ years, an NPS of 93, and has been ranked #1 for Steering of Roaming by Kaleido Intelligence for three consecutive years.
Cellusys firmographics
Firmographics- Name
- Cellusys
- Legal name
- Cellusys
- Website
- https://cellusys.com
- Company type
- Private
- Founded year
- 2004
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Cellusys is a Dublin-based B2B software vendor founded in 2004 that provides roaming management, signalling security, and analytics solutions to mobile network operators worldwide, serving 192 networks and 2.24 billion subscribers across SS7, Diameter, and 5G environments via on-premises and managed-service delivery.
- Ownership category
- akta.pro rank
Cellusys industry classification
Industry- Product category
- Telecommunications Signalling & Roaming Security
- NAICS
- All Other Telecommunications (517810), All Other Telecommunications (5178)
- SIC
- Services-Telephone Interconnect Systems (7385), Communications Services, Nec (4899)
- akta.pro primary industry
- Mobile Wholesale & Roaming Providers (Interconnect, IOT, Roaming Hubs) (HDAIAAAD)
Keywords
Where Cellusys is headquartered
LocationHeadquarters
- HQ city
- Dublin
- HQ country
- Ireland
- HQ region
- Europe
Offices1 record
Markets served
Cellusys business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure
Revenue model
- Enterprise Software Licences & Subscriptions: Licensing and subscription fees for Cellusys roaming, fraud & security, signalling core, analytics, and device management solutions to mobile network operators. Solutions are available on-premises or as a managed service.
- Managed Services: Hosted and managed service delivery of roaming value-added services and security solutions. Partnership with Arelion enables delivery via global IPX network.
- Professional Services: Deployment, configuration, testing, operational handover, and ongoing professional/managed services support. Offered alongside product deployment.
Distribution channels2 records
Marketing channels8 records
Cellusys product offering
Product offeringCore offering
Cellusys provides a multi-protocol signalling and messaging security platform for mobile network operators, covering SS7, Diameter, GTP, SIP, HTTP/2 and SMS. Its product portfolio includes Roaming solutions (Steering of Roaming, Roam Insight, SMS Outreach, Call Correction, IMSI Translator, GTP Proxy, OTA), Fraud & Security modules (Signalling Firewall, Voice Firewall, SMS Firewall, Anti-Phishing, Penetration Testing, False Base Station Detection), a Signalling Core layer (STP, DRA, SCP, SEPP, MNP, Interconnect), Analytics & Monitoring capabilities, Network APIs (Silent Authentication, Number Verification, SIM Swap, Device Location), and Device Management (OTA Server, Entitlement Server). Solutions are deployed on-premises or as a managed service.
Product overview
Cellusys is a platform-plus-modules architecture providing #1 visibility and control across roaming, security, and the signalling core for mobile networks worldwide. The platform is built on two core engineering principles: Visibility (analytics enables decisions across every product) and Control (built in, not bolted on). The product portfolio consists of four integrated solution categories: Roaming (Steering of Roaming, Roam Insight, SMS Outreach, Call Correction, IMSI Translator, GTP Proxy, OTA), Fraud & Security (Signalling Firewall, Voice Firewall, SMS Firewall, SMS Anti-Phishing, Global Threat Intelligence, Penetration Testing, False Base Station Detection), Signalling Core (STP, DRA, SCP, SEPP, MNP, Interconnect & Hubbing), and Analytics & Monitoring (QoS Monitoring, SIM Box Detection, Silent Roamer Detection, IoT Inbound Analytics, Travel eSIM Analytics, Quality Assurance, SMS Blaster Detection). Additional capabilities include Network APIs (Silent Authentication, Device Location, Roaming Status, SIM Swap Detection, Number Verification, Device Information, Fraud & Risk Signals) and Device Management (OTA Server, Entitlement Server). Solutions support both on-premises and cloud deployment with high availability through redundant virtual machines in active/active mode.
Differentiator
Problem solved
Functional benefit
Products and services
- Roaming Solutions Suite
- Fraud & Security Platform
- Signalling Core Virtualised signalling routing and interconnect infrastructure including Signalling Transfer Point (STP) for SS7, Diameter Routing Agent (DRA) for LTE/IMS/EPC, Service Communication Proxy (SCP) for 5G core networks, Security Edge Protection Proxy (SEPP) for inter-PLMN 5G signalling, Mobile Number Portability (MNP), and Interconnect & Hubbing services.
- Analytics & Monitoring Near real-time analytics platform including QoS Monitoring, SIM Box Detection, Silent Roamer Detection, IoT Inbound Analytics, Travel eSIM Analytics, Quality Assurance, and SMS Blaster/IMSI Catcher Detection. Processes signalling events across SS7, Diameter, GTP, SIP, HTTP/2 and SMS to build an up-to-date view of roaming activity, network attachment, service usage and emerging quality issues.
- Network APIs Suite of standardised network APIs enabling operator monetisation including Silent Authentication, Device Location, Roaming Status, SIM Swap Detection, Number Verification, Device Information, and Fraud & Risk Signals. Exposes network capabilities through REST APIs for enterprise and platform partner use cases.
- Device Management Device and SIM lifecycle management solution including OTA Server for remote SIM updates via SMS-based OTA or BIP over HTTPS, and Entitlement Server for in-line validation of device eligibility against subscription data, device capabilities and operator policy in real time. Supports MVNO hosting, sponsored roaming and IoT MVNE environments.
Quantifiable outcome
- 265 million+ scam attempts blocked by U Mobile using Cellusys network-level scam protection
- +2 more outcomes
Companies that use Cellusys
Customer profileNamed customers4 records
Segments3 records
Ideal customer profiles3 records
Cellusys technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration3 records
AI capability4 records
Feature13 records
Cellusys partnerships and signals
Strategic signalPartnerships
Ten partnerships are on record, tiered minor and core.
- SimbaminorSimba deployed Cellusys Steering of Roaming (SoR) service, empowering Simba to automatically respond to network dynamics and gain visibility and control over roaming profitability and quality.
- ArelioncoreArelion and Cellusys partnership delivers a comprehensive suite of hosted roaming value-added services globally via Arelion's global IPX network. The collaboration enhances roaming performance, security, and subscriber experience, supporting operators in managing 5G Standalone implementation and reducing infrastructure costs while improving service quality. Solutions include signalling security, roaming services, and analytics.
- SyniversecorePartnership combines Syniverse's industry-leading IPX network with Cellusys' award-winning signalling VAS solutions ahead of the 5G SA network transition, enhancing mobile network operators' roaming and security capabilities.
- Ribbon CommunicationscoreCellusys acquired Ribbon's DSC product line and will support Ribbon's DSC, STP, DRA, and SP2000 products. This enables Cellusys to support operators relying on Ribbon infrastructure and expand its signalling security and routing portfolio.
- Drei AustriaminorDrei Austria and Cellusys achieved a world first: successfully demonstrating Steering of Roaming for 5G Standalone networks, marking the first SoR implementation for 5G SA environments.
- StacuitycoreStrategic partnership between Stacuity, a pioneer in programmable mobile core network solutions, and Cellusys, the global leader in signalling control solutions, announced ahead of Mobile World Congress 2025. The partnership aims to power mission-critical applications with security and resilience.
- BICScoreBICS, part of the Proximus Group carrying half the world's data roaming traffic, further strengthened its international roaming services through partnership with Cellusys. BICS also entered a Threat Intelligence Partnership with Cellusys to address the surge in mobile fraud.
- iceminorice and Cellusys announced the first deployment of the full suite of Cellusys roaming applications in a continental operator environment, enabling innovative roaming VAS for ice subscribers.
- CSGminorCSG and Cellusys announced an innovative roaming VAS partnership to drive a new era of innovation in roaming, helping mobile operators manage complex roaming agreements, settlements and network quality.
- YaanaminorYaana and Cellusys partnership aims to automate the roaming process using open APIs, eliminating manual configuration and improving operational efficiency.
Scale indicators7 records
Recent moves6 records
Expansion highlights6 records
Cellusys competitors and assessment
Company assessmentDirect peers
- Mobileum: Mobileum is a direct competitor in roaming management, signalling security, and revenue assurance for MNOs, offering a comparable portfolio of steering of roaming, fraud, and analytics products to the same Tier-1 operator customer base.
- BICS (Proximus): BICS is a wholesale carrier carrying roughly half of the world's data roaming traffic and offers fraud/security, roaming, and signalling services that overlap with Cellusys's portfolio, while also being a strategic partner in threat intelligence.
- Enea (AdaptiveMobile Security): Enea's AdaptiveMobile Security unit competes directly in signalling firewall and messaging security for mobile operators, offering SS7, Diameter, and 5G protection products analogous to Cellusys's Signalling Firewall and Voice/SMS Firewall suite.
- Syniverse: Syniverse is a direct competitor and partner in roaming hub and IPX services, also offering signalling security and steering of roaming solutions. Cellusys's recent partnership with Syniverse reflects both collaboration and overlap in the wholesale roaming market.
- TEOCO: TEOCO provides analytics, assurance, and roaming optimisation solutions to operators, with its Helix platform overlapping with Cellusys's Roam Insight and QoS Monitoring modules for roaming service quality and fraud detection.
- Comviva (HPE / Tech Mahindra subsidiary): Comviva competes in mobile value-added services, messaging, and roaming analytics for MNOs, with comparable focus on A2P SMS, signalling, and operator-side monetisation products targeting emerging markets where Cellusys also operates.
- Enghouse Networks (including Openet, Telrad): Enghouse Networks' telecom division provides signalling, roaming, and BSS solutions to MNOs that overlap directly with Cellusys's roaming, interconnect, and signalling core portfolio, targeting similar wholesale and Tier-1 operator customers.
Emerging players
- Mavenir: Mavenir provides 5G core network functions and cloud-native signalling infrastructure (SCP, SEPP) that increasingly overlap with Cellusys's signalling core portfolio, positioning it as a next-generation alternative for operators standardising on cloud-native 5G.
- NetNumber: NetNumber provides signalling security and routing platforms (Titan, multi-protocol signalling) that compete in the same SS7/Diameter/5G signalling firewall and STP/DRA/SCP market as Cellusys, with overlap in security and routing for MNOs.
Broad incumbents
- Hewlett Packard Enterprise (HPE / HPE-Mavenir telecom stack): HPE, through its telecom and Comviva assets, offers broader operator platforms that include roaming, messaging, and analytics components overlapping with Cellusys, positioning it as a larger incumbent able to bundle competing capabilities into operator deals.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Cellusys social profiles
Digital presenceCellusys financial estimates
Financial estimateRevenue estimate
Valuation estimate
Cellusys leadership team
Management profileNumber of profiles
Profiles4 records
Cellusys funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Cellusys M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Cellusys
What does Cellusys do?
Cellusys provides a multi-protocol signalling and messaging security platform for mobile network operators, covering SS7, Diameter, GTP, SIP, HTTP/2 and SMS. Its product portfolio includes Roaming solutions (Steering of Roaming, Roam Insight, SMS Outreach, Call Correction, IMSI Translator, GTP Proxy, OTA), Fraud & Security modules (Signalling Firewall, Voice Firewall, SMS Firewall, Anti-Phishing, Penetration Testing, False Base Station Detection), a Signalling Core layer (STP, DRA, SCP, SEPP, MNP, Interconnect), Analytics & Monitoring capabilities, Network APIs (Silent Authentication, Number Verification, SIM Swap, Device Location), and Device Management (OTA Server, Entitlement Server). Solutions are deployed on-premises or as a managed service.
Is Cellusys a public or private company?
Cellusys is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Cellusys founded?
Cellusys was founded in 2004. It employs 11 to 50 people.
Where is Cellusys based?
Cellusys is headquartered in Dublin, Ireland, in the Europe region.
How does Cellusys make money?
Three revenue lines are on record. Enterprise Software Licences & Subscriptions are the primary driver. The others are managed Services and professional Services.
Who are Cellusys's main competitors?
Direct peers on record are Mobileum, BICS (Proximus), Enea (AdaptiveMobile Security), Syniverse, TEOCO, Comviva (HPE / Tech Mahindra subsidiary) and Enghouse Networks (including Openet, Telrad). Emerging players are Mavenir and NetNumber. Hewlett Packard Enterprise (HPE / HPE-Mavenir telecom stack) is listed as a broad incumbent.
Does Cellusys have an API?
Yes. Cellusys offers REST API integration for external systems. The platform integrates with core network elements (HLR/HSS), translates API requests into network-level interactions, and supports real-time responses. APIs are used for integration with SIEM and analytics platforms, OSS/BSS systems, and network signalling elements including STP, DRA, and SBC. Network APIs enable use cases including Silent Authentication, Device Location, Roaming Status, SIM Swap Detection, Number Verification, Device Information, and Fraud & Risk Signals. Developer documentation is at cellusys.com/network-apis.
What industry is Cellusys in?
Cellusys's product category is Telecommunications Signalling & Roaming Security. Its primary akta.pro industry code is HDAIAAAD, Mobile Wholesale & Roaming Providers (Interconnect, IOT, Roaming Hubs). Its NAICS code is 517810 and its SIC code is 7385.