Spitfire unveils dual-IMSI multi-network IoT data SIM

Spitfire has launched a multi-network IoT data SIM for UK businesses, using a dual-IMSI design that switches between mobile networks if coverage or service is disrupted.

The product targets organisations running connected devices in the field that need continuous mobile data access for monitoring, tracking, telemetry and remote management. The SIM also includes private networking options and security features designed to reduce exposure to hostile activity.

Dual-Network Design

The SIM includes two IMSI profiles. One runs on Spitfire's full MVNO setup, using a direct layer 2 connection into the radio access network of a UK mobile network operator, which Spitfire described as having award-winning coverage.

The second runs on Cellhire's overseas MVNO, with roaming layer 2 access across the other three UK mobile network operators. By default, the Spitfire IMSI is the primary profile and the Cellhire IMSI is the backup. Devices can switch automatically when needed.

Spitfire can also change the priority order over the air, including favouring the Cellhire profile. The same access point name and IP address apply across both IMSIs, so devices do not need network settings changed when moving between profiles.

Pricing Options

Pricing starts at £1 per month, with Pay As You Go, bundle and pooled data options. Spitfire positioned the offer as a way for firms to match data plans to variable device fleets and seasonal usage.

Customers also get an online portal to manage SIM estates and related services, plus account management from an IoT specialist.

Security Focus

Alongside resilience, Spitfire emphasised security and private networking. The SIM includes options linked to Spitfire's One Network and SUN products, offering private network configurations intended to reduce exposure to malicious actors.

IoT deployments often sit outside an organisation's physical perimeter and can involve thousands of devices. Connectivity issues can disrupt data flows and remote administration, so multi-network SIMs are one way to mitigate localised outages, radio access issues or planned maintenance on a single operator network.

Spitfire's approach differs from single-network IoT SIMs and standard consumer roaming. By using dual IMSIs, devices gain an additional network identity, enabling failover without manual configuration changes across the device estate.

Market Context

The UK market for IoT connectivity spans utilities, transport, retail, security, healthcare and industrial operations. Many deployments involve equipment in locations where signal conditions change, including basements, rural areas, construction sites and moving vehicles. In those settings, devices can fall back to 2G, 3G or 4G depending on coverage and hardware, while newer deployments often rely on LTE-M or NB-IoT where available.

When selecting IoT connectivity, businesses typically weigh coverage, resilience, security controls and the operational burden of managing large SIM estates, as well as power consumption and latency. Spitfire highlighted low latency on the primary profile through its direct network connection, and said the secondary profile adds resilience through wider access to UK mobile operators.

Spitfire is based in central London and provides voice, internet, IoT and wide area network services. The company reported more than £23 million in turnover and over 100 staff.

Managing Director Harry Bowlby said Spitfire spent months preparing the product for launch.

"We're very excited to bring our unique dual-IMSI one IP address Multi Network IoT data SIM solution to market after spending many months ensuring we have a product that delivers first class mobile connectivity that is secure and robust. The use cases that IoT enables are endless and the benefits it can offer businesses can be significant. However, without the right level of connectivity the potential of IoT can be stunted - and that is exactly the challenge our solution addresses."

The SIM is available now across Spitfire's pricing plans and can be configured remotely to set different network priorities based on customer requirements.