One IoT SIM Card. All Four UK Mobile Networks.

Connect to EE, O2, Vodafone, or Three on a single SIM card.

100+ 5-Star Google Reviews

Vodafone O2 EE Three
2G, 4G, 5G 4G, 5G 2G, 4G, 5G 4G, 5G
NB-IoT & CAT-M NB-IoT & CAT-M
Fixed IP, VoLTE & SMS Fixed IP, VoLTE & SMS Fixed IP, VoLTE & SMS Fixed IP, VoLTE & SMS

Available as: Triple-cut SIM eSIM

Complete Control Over Network Selection

Unsteered

Let your device select from all four UK networks.

Manual Steering

Remotely select EE, O2, Vodafone or Three.

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250M+ MB

Data Transmitted

500+

Business Customers

4

UK Networks

400+

Global Networks

UK data breakout, backed by UK-based technical support.

As Seen In:

IoT Now
BusinessMole
Powering Channel 4's Hunted

Example cost

100 SIMs, 250MB per SIM

SIM Rental

£1.50

Data

£0.63

Monthly Cost Per SIM

£2.13

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De-Risk Your IoT SIM Procurement

  • Test before you scale
  • No minimum contract
  • No minimum SIM quantity
  • Flexible PAYG pricing
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Trusted by Leading UK Brands

Reliable connectivity across our store estate is essential. With locations spread widely across the UK, having access to multiple mobile networks on a single SIM provides the resilience we need to keep our systems operational.

Shaun Chrimes

Head of IT & Information Security

Retail
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KeySIM has provided a reliable and flexible connectivity solution supporting teams where Ethernet networks were temporarily unavailable.

Steve Senter

Technical Infrastructure Manager

Healthcare
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Having venues in a variety of locations means connectivity isn't always consistent on a single network. KeySIM's multi-network SIM gives us the flexibility to keep our systems connected where it matters.

Chris Mountjoy

Director of IT

Hospitality
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This has significantly improved resilience and ensures continuity of data transmission, supporting the ongoing reliability of the Council's IoT infrastructure.

Scott Andrews

Innovation & Transformation

Public Sector
Read case study

View all IoT SIM case studies →

Real-world deployment

Mission-Critical Connectivity on the Water

KeySIM powers York Rescue Boat with resilient multi-network data, ensuring constant communication in demanding marine environments.

KeySIM

IoT SIM Real-World Deployment | York Rescue Boat

How multi-network IoT SIM keeps crews connected on the water

More on the KeySIM YouTube channel About the KeySIM Foundation

From Launch to 11TB a Month

KeySIM is scaling exponentially, transmitting over 11TB of UK data every month.

Bar chart: KeySIM GB consumed per month from August 2019 to October 2026, growing from almost nothing to over 11,000 GB a month
KeySIM monthly data consumption in GB, August 2019 to October 2026, rising to over 11,000 GB (11TB) a month.

Featured by the IoT M2M Council

Read how NatWest is backing KeySIM's IoT expansion →

Secure remote access

Need secure remote access to your equipment?

Explore Fixed IP IoT SIMs →

Explore Our IoT SIM Types & Features

Find the right SIM type and features for your deployment.

Multi Network SIM

Unsteered access to all 4 UK networks on a single SIM, with remote network steering, UK breakout and stable fixed IP.

Fixed IP SIM

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

M2M SIM Cards

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

NB-IoT SIM

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

CAT-M SIM

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

eUICC

Industrial eUICC IoT SIM cards that can be remotely re-provisioned to a new network operator without a physical SIM swap.

eSIM

SGP.22 and SGP.32 eSIM support for remote profile management on compatible industrial routers and IoT devices.

Remote Access

Fixed IP connectivity through KeySIM's private breakout infrastructure for secure VPN and remote device access.

KeyOnline Portal

Monitor usage, activate or suspend SIMs and steer networks in real time from KeySIM's secure management portal.

IoT SIM — Frequently Asked Questions

An IoT SIM card connects devices to the internet over cellular mobile networks. Unlike consumer SIMs designed for phones, IoT SIM cards are built for long-term deployments where reliability, remote management and predictable costs matter. They are commonly used in routers, CCTV systems, payment terminals, telemetry devices, alarms, vehicle tracking systems and industrial equipment.

Steered multi-network SIMs use a preferred network list (PLMN) to prioritise certain operators, which can hold a device on a weak signal even when a stronger network is available. Unsteered SIMs have no PLMN list, so the modem freely selects the strongest network at any time using standard 3GPP behaviour.

An eUICC (sometimes called eSIM) is an industrial SIM card that can be remotely re-provisioned to an alternative mobile operator over the air, without physically replacing the SIM. It is particularly valuable for long-life industrial deployments where physical access is difficult or expensive.

Internet breakout is the point where mobile data traffic leaves the cellular network and reaches the public internet or private infrastructure. KeySIM operates UK-based private breakout through Tier 1 datacentre locations including Equinix Manchester, Leeds and London via FAELIX, with independent routing as a RIPE NCC member (AS207652).

No. KeySIM operates on a flexible PAYG basis with no minimum terms. SIMs can be activated, paused or stopped as needed without long-term commitment, and dormant SIMs are not purged from the network. View PAYG pricing.

Yes. KeySIM SIMs can be remotely pinned to a specific UK mobile network at SIM level via the KeySIM portal — without any physical access to the device.

A private APN (Access Point Name) creates an isolated network for your devices, keeping traffic off the public internet. This improves security and enables remote access via VPN using private IP addresses. Learn about Fixed IP SIM.

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 EE (2G/4G/5G/NB-IoT/CAT-M), Vodafone (2G/4G/5G/NB-IoT/CAT-M), O2 (4G/5G), and Three (4G/5G). Our multi-network SIMs can also roam on 400+ networks globally. View the full global roaming list.

KeySIM is trusted by over 500 UK organisations across sectors including retail, healthcare, hospitality, construction, public sector and emergency services. Read our IoT SIM case studies.

KeySIM offers several IoT SIM types: M2M SIM cards for payment terminals, CCTV and fleet; NB-IoT SIM for low power, long-life static devices; CAT-M SIM for mobile devices needing lower latency; Fixed IP SIM for secure remote access via private IP addressing; and Multi Network SIM for unsteered access across all 4 UK networks.
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Ready to Get Started with our IoT SIM?

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

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