The connectivity & resilience partner

Trusted connectivity for regulated environments. Private, secure, and resilient, with full end-to-end control.

Talk to a Connectivity Specialist See How We Deliver Resilience

Designed for high-risk environments

Where uptime and compliance are non-negotiable.

Built to operate at scale

Trusted to support complex, distributed estates.

Delivered as a managed service

Continuously monitored, supported and assured.

Why businesses choose CSL

Private, secure infrastructure

Private IP, private APNs, DualCore architecture – built for regulated environments.

End-to-end chain of control

From device to core network – one accountable partner for uptime and compliance.

Unsteered, multi-network resilience

Always on connectivity with no single point of failure.

24/7/365 human-led support

Real experts, proactive monitoring, and remote intervention.

Regulatory & sector expertise

Aligned to leading standards, industry bodies and quality frameworks.

Proven at scale

Supporting millions of global connections, major government programmes and multi-site deployments.

Trusted for over 30 years to keep critical operations connected, compliant and resilient.

Criticality defined for your environment

GEO Critical

Systems and services operating across wide geographies where downtime affects coverage, coordination, or national infrastructure.

Business Critical

Operational continuity where outages impact revenue, service delivery, or compliance.

Mission Critical

High priority operations where failure disrupts essential functions, safety, or emergency response.

Life Critical

Environments where connectivity supports vulnerable people or life-saving technology.

Trusted partner behind global deployments

We deliver trusted connectivity across the world’s most demanding regulated environments.

Certified to the Highest Industry Standards

Active members of leading industry bodies, including GSMA & TechUK
QSF aligned for safety & quality in Technology Enabled Care
Designed for trust, privacy & security, aligned to UK/EU standards
ISO27001 certified for highest information security controls
ISO14001 certified for environmental responsibility
ISO9001 certified for consistent quality management

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

Retail & Hospitality

Statieheld

How Statieheld unlocked nationwide expansion, streamlined operations, and eliminated connectivity barriers with a powerful multi-network IoT solution.

Industrial

Philadelphia Scientific

Discover how Philadelphia Scientific UK enhances battery monitoring solutions with our multi-network roaming IoT SIM, ensuring stable global connectivity and seamless data transmission.

Man looking at CCTV on computer monitors image

Transport & Logistics

Rewire Security

Discover how Rewire Security leverages our multi-network roaming IoT SIM to ensure reliable GPS tracking connectivity, offering seamless data transmission, flexibility, and enhanced operational efficiency.

senior women using tablet smartphone image

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.

Explore our latest news, information and updates

News

DualCom Pro 4 Named as a Finalist at PSI Premier Awards 2026

The DualCom Pro 4 has been nominated for Technology Innovation of the Year at the PSI Awards 2024.

Construction Site Connectivity FAQ

On a digitised construction site, whether a concrete pour proceeds, a crane lift starts, or a gate opens on time can depend on whether the site network is up and running. This FAQ works through what that means in practice: correlated outages, multi-network versus DUAL-CORE, the real cost of downtime, and the equally vital early-phase coverage.

Lone Worker Connectivity FAQ

Answers to common questions about how lone worker connectivity works in 2026, covering multi-network versus multi-core, voice roaming, BS 8484, the 2G sunset timeline, and battery life in the field.

Lone Worker Connectivity in 2026: Specifying the Protection Chain

A lone worker device can look fully connected on the monitoring platform and still fail to deliver an alarm to the alarm receiving centre. Closing that gap means specifying and evidencing the whole connectivity path, not just the device.

Satellite is moving into the cellular roadmap: An emerging layer for critical IoT

An introduction to CSL Group’s Resilient Connectivity Series on NTN satellite and Direct-to-Device for critical IoT, May 2026.

rSIM® Technology added to the CSL Connected range with Orisec

Critical Connectivity Experts, CSL, and leading UK security manufacturer, Orisec, have announced the next step in their partnership with the introduction of rSIM® technology across CSL Connected – marking a first for the security market.