Critical IoT connectivity experts.

Connecting the critical moments that matter—We deliver reliable IoT solutions for Life Critical, Mission Critical and Business Critical needs, keeping over three million devices connected 24/7.

Discover more
Decorative swirl image
Life Critical icon

Life Critical

Protecting people’s safety in high-stakes situations where real-time data is crucial.

Mission Critical icon

Mission Critical

Supporting the essential infrastructure that keeps a country running.

Business Critical icon

Business Critical

Ensuring business continuity where connectivity loss poses serious commercial risk.

Video poster

Critical Capabilities
What we do

We’re all about resilience. We provide:

  • Proactive monitoring and support services to ensure uninterrupted operations and rapid response in critical situations
  • Reliable connectivity in the toughest and most remote environments
  • Over 30 years of experience in delivering trusted and innovative solutions
About us

We deliver trusted solutions across diverse sectors, many in highly regulated environments:

Infrastructure

Providing reliable connectivity solutions to keep essential systems operational and resilient, with 24/7 support and proactive monitoring.

Industrial

Enabling real-time connectivity for efficient, safe project management and compliance.

Healthcare & Telecare

Providing secure, always-on connectivity to support patient monitoring, emergency response and remote care.

Building & Security

Ensuring reliable, low-latency connectivity for surveillance, secure communications and threat detection.

Transport & Logistics

Facilitating continuous fleet communication and tracking, boosting operational efficiency and ensuring compliance.

Commercial

Improving operational efficiency with scalable, reliable solutions, including point-of-sale connectivity and disaster recovery.

Retail & Hospitality

Supporting seamless operations and customer experiences through secure, resilient smart solutions.

Utilities

Providing compliant, protected IoT connectivity to support critical services and uphold public safety standards.

Decorative swirl image
30

Years of critical connectivity

3
M

Devices with IoT connectivity

24/7

Response and assistance, and rapid resolution

4G/5G

Solutions for 2G, 3G and PSTN Switch-Offs

Talk to us

See how our solutions deliver results—explore our latest case studies:

Healthcare & Telecare

Careium

Careium, is a global leader in Technology-Enabled Care (TEC) solutions, offering secure and reliable telecare systems for older and vulnerable people.

Trusted by global brands and top MNOs, we provide solutions that drive success for industry leaders.

Explore our latest news, information and updates

News

The growing role of body-worn cameras: Security, transparency, and the need for connectivity

In today’s connected world, body cameras have become indispensable across scenarios like law enforcement, private security, lone workers, and public services.

CSL’s rSIM powers always-on connectivity in collaboration with Rogers

We are delighted to announce the launch of CSL Satellite, providing Critical Connectivity to remote or challenging environments, where mobile or fixed broadband options are unavailable or unreliable.

CSL’s VoiceLink solution takes centre stage at two prestigious industry awards

We are delighted to announce the launch of CSL Satellite, providing Critical Connectivity to remote or challenging environments, where mobile or fixed broadband options are unavailable or unreliable.

CSL’s Celebrates the winners of the WorldSkills UK 2024 finals

CSL is delighted to congratulate the winners of the WorldSkills UK 2024 competitions in Fire Detection & Alarm Systems and Electronic Security Systems

CSL wins gold supplier award at Johnson Controls EMEA suppliers conference 2024

CSL wins gold supplier award at Johnson Controls EMEA suppliers conference 2024

CSL group expands leadership with Helen Badger and Glenn Fishwick

CSL group expands leadership with Helen Badger and Glenn Fishwick

The rising demand for Critical IoT Connectivity: How CSL’s resilient rSIM is shaping the future of connectivity

In a world that is more and more connected, there is a rising need for strong and dependable Internet of Things (IoT) connectivity. As organisations in industries like healthcare, transport, and national infrastructure integrate IoT solutions to improve their functioning, the demand for reliable, always-on IoT connectivity has become ‘critical’. This change is influenced by the increasing significance of these solutions, which are now considered vital for the effectiveness and security of most IoT systems.