KeySIM - IoT SIM Card for UK Businesses @KeysimSim

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KeySIM Appoints Marek Isalski as Chief Network & Infrastructure Officer KeySIM has appointed Marek Isalski as Chief Network & Infrastructure Officer, strengthening its focus on carrier-grade infrastructure, resilience and technical capability. Marek has formally accepted the executive leadership role as part of KeySIM’s continued investment in its network strategy and long-term infrastructure development. The role formalises Marek’s growing involvement as KeySIM expands its multi-network IoT platform and connectivity infrastructure. An industry stalwart, Marek is also the Founder and Managing Director of FAELIX, a highly specialised UK ISP and network engineering company known for delivering bespoke connectivity, internet transit, DDoS protection and critical infrastructure services to telecoms providers, enterprises and public sector organisations. As a RIPE NCC and LINX member, KeySIM said the appointment reflects its commitment to infrastructure ownership, network performance and resilience as demand for IoT connectivity grows. Graham Robinson, Founder of KeySIM, said: “Marek has become a hugely important part of KeySIM’s technical growth and infrastructure strategy. This appointment recognises his personal contribution and the role he has played in helping us scale technically, while our strong working relationship with FAELIX continues unchanged.” Marek Isalski added: “KeySIM has always taken a strong infrastructure-led approach to connectivity, focused on resilience and long-term investment. I’m excited to continue supporting the company’s growth and future network strategy, alongside the ongoing collaboration between KeySIM and FAELIX.” The appointment comes as KeySIM expands its position in the UK IoT connectivity market through its multi-network SIM platform and specialist connectivity services.

Understanding SIM switch timing on Teltonika routers is becoming increasingly important as more businesses move towards eSIM technology and deploy multiple SIM profiles within a single router. In this video I explain how the “Check Interval” and “Check Count” parameters work together, and why misunderstanding these settings can lead to poor failover performance in real-world deployments. The calculation is simple: Check Interval × Check Count = Total failover decision time For example: 360 second interval × 10 checks = 3600 seconds (60 minutes) This means a router could potentially remain connected to a degraded or congested mobile network for up to an hour before a SIM switch is triggered. However, these settings must be carefully balanced. If failover thresholds are too aggressive, routers may switch SIMs unnecessarily, creating instability and excessive network changes. If they are too relaxed, devices may remain on deteriorated connections for extended periods, negatively impacting performance and application reliability. As Teltonika eSIM routers become more widely adopted and businesses begin loading multiple operator profiles into a single device, these configuration parameters will move increasingly to the forefront of professional IoT and M2M network design. Understanding how these timers work is fundamental to building stable, intelligent and resilient cellular failover solutions.

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Teltonika Networks SMS commands can bring offline device online which saves people site visits Basic level command is reboot but there is multiple commands that can be crucial including factory restore which fixes lock out due to misconfiguration by the customer These are not small features as we have customers with deployments on restricted sites so getting access requires planning and administrative work Imagine how happy they are when they avoid all that hassle with a quick SMS command It is important you record your default admin passwords for in the event you use restore command as it reverts to default Many people use IoT SIM Cards and Teltonika routers without knowing SMS commands exist

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Here’s a polished version that keeps the real-world angle and reads naturally: Scott, ITDT Manager at Conwy Borough Council, had been experiencing connectivity issues with a critical gateway installation in Llandudno. During periods of network congestion, particularly during busy holiday seasons and bank holiday weekends, the device would intermittently go offline, affecting the reliable transmission of IoT sensor data. After installing a KeySIM multi-network IoT SIM, the device was able to reconnect and gain access to alternative mobile networks when congestion occurred, restoring reliable connectivity. Cases like this highlight the real-world benefit of multi-network IoT SIM technology. Coverage maps only tell part of the story. In live deployments, local congestion, outages and changing conditions can significantly affect performance. Having access to multiple UK networks gives devices more opportunities to stay connected when a single network struggles. For critical IoT deployments, resilience often matters more than signal bars.

Testing eSIM vs physical SIM performance on the Three network using our multi-network IoT SIMs. There is often a misconception that eSIMs are somehow slower or faster than traditional physical SIM cards, so I decided to carry out a controlled test to see if there was any measurable difference in real-world performance. To ensure the test was fair and consistent, both the eSIM and the physical SIM were connected to the exact same Three cell ID before testing began. This is important because connecting to different masts or sectors can completely distort speed test results. The outcome was exactly what we expected — there were no speed differences between the eSIM and the physical SIM. Both technologies delivered virtually identical performance when connected to the same network infrastructure. This demonstrates that eSIMs are simply a different method of provisioning connectivity, rather than a faster or slower radio technology. For IoT deployments, eSIMs are likely to become increasingly important because they allow remote provisioning and supplier changes without the need for physical site visits or SIM swaps.

It is a honour to support K-SOC with resilient multi-network connectivity across Vodafone, O2, EE and Three.

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Contact KeySIM if your machine SIM Cards are causing problems.

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500+ UK Businesses use KeySIM KeySIM is a IoT SIM Card that connects machines to the internet KeySIM connects to Vodafone, O2, EE and Three for maximum coverage

HFM SmartFarm use KeySIM's IoT SIM to connect pitch marking robots to the internet on Vodafone, O2, EE and Three.

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