Why Your Roaming SIM Isn’t Enough: The Truth About Cellular IoT Resilience
Introduction If you manage a fleet of cellular routers, CCTV cameras, or remote sensors, you have likely been…
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IoT & M2M Connectivity - UK Based
Multi-Network SIM Cards for Industrial IoT
Multi-IMSI SIM, eSIM, IoT SIM and fixed IP data solutions. All four UK networks on a single SIM. No dead zones. No single point of failure.
What We Cover
Every Type of IoT & Roaming SIM.
From multi-IMSI industrial SIM cards to travel eSIMs for MiFi hotspots. Find the right connectivity solution for your use case.
Multi-IMSI SIM
Multiple network identities on one SIM. Automatic steering to the best network. No single point of failure.
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IoT eSIM / eUICC
MFF2 and plug-in form factors. Remote SIM provisioning via GSMA SGP.02 and SGP.32. No physical SIM swap needed.
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IoT SIM Cards
M2M data SIM cards for routers, gateways, CCTV, telemetry and industrial devices. UK and worldwide options.
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Fixed IP SIM
Static public IP address on your SIM. Essential for VPN tunnels, SCADA access and remote device management.
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Roaming eSIM
eSIM with international roaming built in. Switch profiles remotely when entering new territories.
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Multi-Network eSIM
eSIM that carries profiles for multiple operators. Connects to the strongest available network at any location.
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Travel SIM
Stay connected in 180+ countries without bill shock. Pre-pay travel SIM cards for phones, tablets and MiFi routers.
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MiFi & Dongles
Pocket Wi-Fi routers, 4G dongles and mobile hotspot devices. Full guide and reviews at dongle.co.uk.
Visit dongle.co.uk →
Network Coverage
All four UK networks. One SIM.
Your device connects to the strongest signal at any location. No manual reconfiguration. No dead zones where at least one network has coverage.
EE
BT Mobile EE
99% UK population coverage
Vodafone
Vodafone UK
99% UK population coverage
O2
O2 Telefonica UK
98% UK population coverage
Three
Three UK
97% UK population coverage
Fixed IP SIM Cards
Fixed IP SIM Cards — Remote Access Without the Headaches
A fixed IP SIM card (also called a static IP SIM) retains the same public IP address every time the device connects to the network. Without a fixed IP, the IP address changes at every reconnection — making it impossible to initiate a connection to the device without dynamic DNS workarounds or a VPN concentrator.
Fixed IP SIMs are essential for any deployment where you need to reach the device: industrial routers running VPN tunnels, IP cameras and CCTV systems, SCADA and PLC remote access, ATM and payment terminal management, utility meter reading systems.
Public vs private IP: a public fixed IP is directly reachable from the internet. A private fixed IP (via private APN) is only reachable from within a secure VPN or MPLS network — better for high-security environments. We offer both. Contact us to discuss private APN configurations.
Fixed IP — same address every session
Session 181.153.44.12
Session 281.153.44.12
Session 381.153.44.12
Remote accessAlways reachable
Dynamic IP — changes every session
Session 1100.72.18.44
Session 210.213.66.9
Remote accessNot reliable
Transparent Pricing
Fixed IP Roaming SIM Cards
All plans include all four UK networks, fixed public IP, and SIM management platform. Data is pooled. No setup fees. 12-month Direct Debit.
Teltonika eSIM Router RUT241 Global LTE 4G Router with WiFi and 2 x Ethernet and physical SIM slot plus eSIM (up to 7 eSIM profiles)
£0.00
per SIM / per month
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Most Popular
Teltonika RUTM51 5G Router
£0.00
per SIM / per month
The Teltonika RUTM51 is a budget-friendly industrial 5G router offering high-speed connectivity for data-intensive applications. It provides seamless performance with dual-SIM support, multi-network compatibility, and robust security features, making it an ideal solution for businesses seeking reliable and flexible networking.
Key Features:
5G SA & NSA support with up to 3.4 Gbps speeds
Dual-SIM with auto-failover functionality
5x Gigabit Ethernet ports
Dual-band Wi-Fi (802.11ac Wave 2)
Backward compatible with 4G LTE Cat 12
Part Number : RUTM51100500 (includes UK PSU)
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Teltonika RUT901 CAT4 4G Router with 4 x Ethernet and WiFi
£0.00
per SIM / per month
Teltonika RUT901 CAT 4 Industrial Cellular Router
4G (LTE) – Cat 4 up to 150 Mbps, 3G – Up to 42 Mbps, 2G – Up to 236.8 kbps
Dual SIM with auto-failover, backup WAN and other switching scenarios
Wireless Access Point with Hotspot functionality
Multiple protocols supported including MQTT, Modbus TCP, DNP3
Antennas: 2 x SMA for LTE, 2 x RP-SMA for WiFi antenna connectors
1 x WAN port 10/100 Mbps, compliance IEEE 802.3, IEEE 802.3u standards, supports auto MDI/MDIX
3 x LAN ports, 10/100 Mbps, compliance IEEE 802.3, IEEE 802.3u standards, supports auto MDI/MDIX
18-month warranty
Manufactured in Europe
Remote Management System available
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Need NB-IoT, private APN, multi-IMSI or eSIM? Get a custom quote.
Use Cases
Built for Every IoT Application
Industrial connectivity that works where standard SIMs fail.
Fleet & Telematics
Vehicle tracking, driver behaviour, tachograph integration. UK and European roaming.
GPS Tracking
Asset and equipment tracking. Works in rural areas where single-network SIMs drop out.
Card Payment Terminals
PDQ machines, kiosks, vending and ATMs. High availability, low data, fixed IP.
Digital Signage
Remote content updates over cellular. Pooled data keeps costs manageable at scale.
SCADA & Remote Control
PLC access, industrial automation, utility systems. Fixed IP essential.
Healthcare IoT
Remote patient monitoring, medical equipment telemetry, ambulance connectivity.
Asset Management
Field equipment, industrial assets, construction plant. Track, monitor and manage.
Automotive & EV
Connected vehicles, EV charging point monitoring, in-car entertainment systems.
All Applications →
See the full list of supported use cases and vertical market solutions.
Technical FAQ
Common Questions. Direct Answers.
No fluff. No sales patter. If the answer isn't here, ask us directly.
What is the difference between a roaming SIM and a multi-IMSI SIM?
A roaming SIM uses one IMSI and accesses partner networks through inter-operator roaming agreements. A multi-IMSI SIM holds several IMSIs, each linked to a different operator, and registers as a local subscriber on each one. Multi-IMSI bypasses roaming overhead, is faster to switch networks, and often provides better pricing control.
What is a fixed IP SIM card and do I need one?
A fixed IP SIM assigns a permanent public IP address to your device. You need one if you need to initiate a connection to the device — remote access, VPN, SCADA, IP cameras. Without a fixed IP, the address changes every session and the device is unreachable from the internet without workarounds like dynamic DNS.
What is the difference between SGP.02 and SGP.32 for IoT eSIM?
SGP.02 is the original GSMA M2M remote provisioning standard — the one most industrial eSIMs in the field use today. SGP.32 is the newer standard, designed specifically for constrained IoT devices with low power and bandwidth. SGP.32 introduces the iSIM architecture and is what you should specify on new hardware procured from 2024 onwards.
Can I use a roaming SIM in a Teltonika router?
Yes. Our SIM cards are compatible with all Teltonika router models including the RUT200, RUT241, RUTX11 and RUTX50. We supply Teltonika routers as well and can pre-configure them with the correct APN settings before shipping. For bridge mode vs IP passthrough configuration, see our Teltonika setup guide.
What is NB-IoT and when should I use it instead of 4G?
NB-IoT is a low-power cellular standard for devices that transmit small amounts of data infrequently. Choose NB-IoT when battery life matters most — smart meters, environmental sensors, trackers in deep locations. Choose 4G LTE when you need throughput, low latency, or real-time video. Both use the same licensed cellular infrastructure.
What is a private APN and why would I need one?
A private APN creates an isolated data path between your SIM cards and your corporate network, bypassing the public internet entirely. Traffic never touches the public internet — it travels from device to your network over a private tunnel. This is standard for utilities, financial services, healthcare and any deployment where public internet exposure is unacceptable.
What does pooled data mean in practice?
With pooled data, your total monthly allowance is shared across all SIM cards on your account. A device using 5 MB and a device using 500 MB both draw from the same pool. This is more cost-effective than per-SIM caps for fleets with variable usage — you pay for total consumption, not the worst-case individual device.
What is a travel SIM and is it the same as a roaming eSIM?
A travel SIM is a physical SIM designed for use in multiple countries without standard roaming charges. A roaming eSIM does the same job but is provisioned electronically to a compatible device. For MiFi use, a physical travel SIM is usually more practical — MiFi routers generally don't support consumer eSIM. See dongle.co.uk for MiFi device guides.
Technical Guides
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In-depth technical articles on IoT connectivity, SIM management and industrial networking.
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One SIM or a thousand. Tell us what you're building and we'll spec the right solution. No obligation. No sales scripts.