Personal safety devices and asset trackers — backed by real-world experience deploying over 10,000 tracking devices across the UK.
For KeySIM, Teltonika tracking devices represent far more than simply another hardware range. Before the creation of KeySIM, the founding team — Graham Robinson and James Adam — built and operated a successful lone worker protection platform using Teltonika personal safety devices, deploying more than 10,000 devices to lone workers throughout the United Kingdom.
Real Deployment Experience
The lone worker platform was built around the Teltonika GH4200 — the predecessor to today's GH5200. Working alongside Teltonika during the early development of the platform, the team helped shape real-world deployment requirements before rolling out at scale.
Unlike many technology products that are deployed simply for convenience, lone worker devices are often used during genuine emergencies. Over the years, the platform was involved in numerous incidents where workers required assistance, emergency services intervention or welfare checks. In many cases, the ability to rapidly identify a worker's location and establish communications played a significant role in achieving a positive outcome.
This experience provided a deep understanding of GPS tracking technologies, cellular connectivity, SMS communications, large-scale deployments and real-world coverage challenges — and many of those lessons ultimately influenced the creation of the KeySIM connectivity platform.
Sectors served by the original lone worker platform:
Lone worker devices deployed across the UK
Platform used during genuine incidents requiring emergency services
The most important thing to understand when selecting a tracking device
Not all trackers are designed for the same purpose. Some are designed to protect people. Others are designed to protect assets. The GH5200 is a personal safety device designed around worker protection and emergency communications. The TAT140 is an asset tracker designed around battery life, theft recovery and long-term unattended operation.
The GH5200 has been specifically designed to protect people. It combines GPS positioning, voice communications, SMS messaging and cellular data connectivity within a compact wearable form factor — making it particularly attractive for organisations with a duty of care towards employees working alone, travelling between sites or operating in potentially hazardous environments.
Many tracking devices simply tell you where somebody is. The GH5200 allows you to communicate with them directly as well. In emergency situations, location information alone is often not enough — the ability to establish two-way voice communications is one of the key reasons this device stands apart.
Safety Features
Immediate emergency alert with GPS coordinates, SMS notification and optional voice call.
Automatically raises an alarm if a worker falls or remains motionless for a defined period.
Voice calling via the same KeySIM SIM card alongside GPS tracking and SMS alerting.
Real-time location transmission for workforce visibility and rapid emergency response.
The GH5200 uses traditional LTE technology with 2G fallback for voice. O2 no longer supports traditional 2G voice services for roaming partners, and Three has historically not supported traditional roaming voice. At the time of writing, Vodafone and EE continue to support 2G voice services for KeySIM customers. EE intends to retire its 2G network from May 2029; Vodafone from 2030. The GH5200 continues to have a substantial operational lifespan ahead of it, but organisations planning very long-term deployments should consider this transition.
Where the GH5200 is designed to protect people, the TAT140 is designed to protect assets. It combines GPS positioning, cellular connectivity and exceptionally long battery life within a rugged enclosure designed for long-term unattended operation.
Because the tracker is self-contained and battery powered, it can often be installed discreetly within equipment — making it particularly useful for theft recovery applications.
Typical applications:
Why LTE-M for Asset Tracking?
Unlike the GH5200, which needs to support real-time voice calls and requires traditional LTE, the TAT140 is designed to communicate with software platforms. For this purpose, Teltonika selected LTE-M and NB-IoT technologies rather than traditional broadband LTE — consuming significantly less power whilst offering excellent coverage characteristics.
In our own testing we have observed locations where LTE-M and NB-IoT connectivity was available despite traditional broadband cellular services being unavailable — including at the Great Orme in Llandudno, where we successfully established connectivity in an area where conventional services had historically been challenging.
KeySIM supports LTE-M and NB-IoT services across Vodafone, EE and Three where available.
Designed for equipment that may spend long periods parked or unused with no charging available.
LTE-M and NB-IoT better penetrate containers, plant rooms and underground locations.
More Devices Coming Soon
Full guide coming soon. Contact us for information about this device.
Full guide coming soon. Contact us for information about this device.
Contact our team to discuss tracking device selection, SIM connectivity options and voice service requirements.