#1 name in Signalling

#1 visibility and control across roaming, security, and the signalling core

In 20 years, we've never lost a customer

20+

Years Experience

93

NPS Score

#1

Market Leader

#1 Trusted by Mobile Operators, over two decades

Steering of Roaming

Signalling Firewall

SMS Firewall

Voice Firewall

2.24 Billion Subscribers

Served by Cellusys solutions

Engineering with two core principles

Means Secure, Intelligent, Profitable networks.

Visibility

Analytics enables decisions across every product

Control

Built in, not bolted on

Solutions

Roaming

Fraud & Security

Signalling Core

Analytics & Monitoring

Across 192 networks, with 137 partners

What our customers say

"Cellusys Signalling FW is wise. Many actions that could not be done on other networks nodes, could be done on Cellusys SFW."

Hikmet Yavuzer, Voice Core Operations Manager

NPS Score: 93

Industry-leading measure of customer loyalty

The Telecoms Conversation

Best Practice Roaming Breakfast Seminar

Best Practice Roaming Breakfast Seminar

We hosted at WAS#21, Dubai, 8–10 April 2025

Travel eSIMs: the blind spot in MNOs' roaming strategies

Travel eSIMs: the blind spot in MNOs' roaming strategies

Charles Bernard

The Cellusys Library

Animation available on desktop

Other pages of interest

CodeCamp 5 cohort

CodeCamp

Fully funded software engineering programme developing the next generation of tech talent in Africa.

Cellusys team at an industry event

People

#1 is not by chance. It's our people.

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