IoT SIM card providing multi-network connectivity across all four UK mobile networks for reliable business IoT deployments

IoT SIM with Multi-Network Coverage

An IoT SIM that connects to all 4 UK networks for maximum uptime, with UK-based private network breakout. No minimum contracts, simple PAYG pricing, and secure remote access via private fixed IP connectivity.

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71M+

MB transited in 2025

500+

Business Customers

4

UK Networks Supported

100+

Countries Covered

Why 500+ UK Businesses Choose Our IoT SIM Card

Our IoT SIM connects to Vodafone, O2, EE and Three — automatically switching to the strongest available signal for maximum uptime.

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Multi-Network SIM Coverage

Our IoT SIM cards access all four major UK networks, ensuring reliable multi-network connectivity wherever your devices are deployed.

Learn about M2M SIM →
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PAYG No Minimum Contract

Flexible PAYG IoT SIM solutions without long-term commitments. Scale your IoT connectivity up or down as your business needs change.

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Simple IoT Management Portal

Easy-to-use control panel for monitoring IoT SIM usage, managing devices, and controlling costs in real-time.

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Private Fixed IP Secure Access

Enterprise-grade security with Private Fixed IP addresses and VPN capabilities for safe remote IoT device management and data transmission.

About Fixed IP SIM →
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Business-Focused IoT Solutions

Dedicated account management and technical support designed specifically for business IoT connectivity and enterprise needs.

KeySecure features →
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Scalable IoT Connectivity

From single device pilots to large-scale IoT deployments, our multi-network SIM solutions grow with your business requirements.

Network Steerer →

Explore Our IoT SIM Connectivity Options

Not every IoT deployment is the same. Find the right connectivity technology for your devices.

M2M SIM Cards

Reliable device connectivity for payment terminals, CCTV, fleet and remote infrastructure.

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NB-IoT SIM

Low power, long-life connectivity for static sensors, meters and devices that send small amounts of data.

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CAT-M SIM

Mobile IoT connectivity for asset tracking, telematics and devices that move or communicate frequently.

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Fixed IP SIM

Secure remote access to routers, CCTV and field equipment via private or static IP addressing.

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Connected to All Major UK Networks

Our IoT SIM connects to Vodafone, O2, EE and Three for maximum uptime and coverage

2G/4G/5G/NB-IoT/CAT-M
4G/5G
2G/4G/5G/NB-IoT/CAT-M
4G/5G

Member of RIPE NCC (IP Network Authority)

RIPE NCC Member - KeySIM is an accredited member of RIPE Network Coordination Centre

What Our Customers Say

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"Fantastic customer service and extremely knowledgeable about IoT connectivity. Great product at a great price point."

Andrew Deptford
Business Owner | Brightsparks Studio
⭐⭐⭐⭐⭐

"Excellent service, very easy to deal with."

Patrick Coleman
Technical Director | Pemberton Digital
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"My charity has used KeySim for over a year now and they have ensured we have had continuous service where other providers cannot get a signal."

Richard McLennan
Chairperson | Safebase Scotland

KeySIM in the Press

KeySIM strikes remote SIM deal with Wired Broadcast

Mobile News | March 2024

Telecom specialist KeySIM has entered into a partnership with connectivity provider Wired Broadcast to supply remote-provisioned multi-network SIMs. These SIMs support major UK mobile operators and hundreds of global networks, and can be managed via a portal — removing the need for hardware reconfiguration on-site.

Read the full article →

KeySIM featured in Broadcast Tech for powering Channel 4's Hunted

Broadcast Tech | October 2025

In Hunted, ordinary contestants go "on the run" while a team of expert Hunters uses technology to emulate state-level surveillance. Body cams use network-hopping SIM cards provided by KeySIM, paired with a custom dispatch unit from Nvoyy, allowing stable, prioritised video links to HQ.

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York Rescue Boat upgrades emergency communications with IoT SIM connectivity

York Rescue Boat

York Rescue Boat has deployed KeySIM's multi-network IoT SIM cards to power its on-water communications and emergency response systems. The volunteer crew relies on resilient, always-on connectivity to coordinate rescues and maintain contact with emergency services.

Read the case study →

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Real-World Case Study

KeySIM Proven in Real-World Deployments

See how our IoT SIM delivers reliable multi-network connectivity in real deployments.

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IoT SIM — Frequently Asked Questions

Everything you need to know about KeySIM's multi-network IoT SIM cards.

A multi-network IoT SIM card can connect to multiple mobile networks — Vodafone, O2, EE, and Three in the UK — automatically, ensuring your IoT devices stay online even if one network has poor coverage or experiences issues. KeySIM's multi-network SIMs provide superior reliability for business-critical applications.

Yes — KeySIM offers fully flexible Pay As You Go (PAYG) IoT SIM cards with no minimum contract requirements. You only pay for the data you use, with transparent pricing and no hidden fees. See our PAYG pricing here.

A Private Fixed IP address is a static, dedicated IP address assigned to your IoT SIM card that never changes. This allows secure remote access through VPN connections without exposing devices to the public internet. Learn more about Fixed IP SIM.

KeySIM supports all four major UK networks: Vodafone (2G/4G/5G/NB-IoT/CAT-M), O2 (4G/5G), EE (2G/4G/5G/NB-IoT/CAT-M), and Three (4G/5G). Our multi-network SIMs can also roam on hundreds of networks globally. View the full global roaming list.

KeySIM is trusted by over 500 UK businesses with more than 10,000 active IoT connections across sectors including retail, security, agriculture, construction, and emergency services. Read our IoT SIM case studies.

KeySIM offers several IoT SIM types to suit different deployments. M2M SIM cards cover general device connectivity including payment terminals, CCTV and fleet. NB-IoT SIM is designed for low power, long-life static devices that send small amounts of data. CAT-M SIM suits mobile devices that communicate frequently or need lower latency. Fixed IP SIM provides secure remote access via private or static IP addressing.
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Ready to Get Started with our IoT SIM?

Join over 500 UK businesses using our IoT SIM for reliable multi-network connectivity. Flexible PAYG pricing with no minimum contracts.

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