Teltonika FMC125 — Professional 4G LTE Cat 1 GPS Tracker with Dual SIM and RS232/RS485

The Teltonika FMC125 is the 4G LTE Cat 1 upgrade of the FMB125 — Teltonika's most widely deployed professional GPS tracker — bringing all the dual SIM, RS232/RS485 and 1-Wire capability of the FMB125 to modern 4G networks. Built on the proven Teltonika FMB platform, the FMC125 retains every feature of the FMB125 and adds industry-leading 4G LTE Cat 1 connectivity with 2G fallback, delivering faster data transmission, lower latency and future-proof network compatibility for professional fleet management applications across the UK and internationally.

Designed to communicate with third-party RS232 and RS485 devices including digital fuel level sensors, Garmin navigation devices and RFID readers, the FMC125 is equally suited to heavy duty fleet management, refrigerated transport, international logistics and car sharing — covering a broader range of professional fleet applications than almost any other single 4G tracker on the market.

As an official Teltonika distributor in the UK, Tracking Hardware UK ships the FMC125 directly from our London warehouse — with trade pricing available for telematics service providers, fleet operators and resellers.

Key Features

• 4G LTE Cat 1 with 2G fallback — future-proof connectivity with faster data speeds, lower latency and more reliable performance on modern UK networks, with automatic 2G fallback ensuring continuous coverage

• Dual SIM — automatic failover between two SIM cards, significantly reducing international roaming costs and providing a backup communication channel where single operator coverage is insufficient

• RS232 and RS485 interfaces — connect digital fuel level sensors, Garmin navigation devices, RFID readers, barcode scanners and other third-party serial devices for extended fleet monitoring

• 1-Wire interface — connects temperature sensors for refrigerated transport and cold chain compliance monitoring and iButton for driver identification — compatible with the Tracking Hardware UK 1-Wire driver identification keypad

• Bluetooth 4.0 — connects to BLE sensors and EYE accessories for extended environmental and asset monitoring, and supports ADAS camera integration

• Remote immobiliser — digital output allows remote vehicle disabling via your fleet management platform

• Crash and tow detection — built-in accelerometer triggers alerts on impact or unauthorised movement

• Jamming detection — alerts when GPS signal interference is detected

• Green driving monitoring — tracks harsh braking, acceleration and cornering for driver behaviour scoring

• CAN bus compatible — works with Teltonika CAN adapters for deep vehicle data reading

• 170mAh Li-ion backup battery — maintains device operation if vehicle power is interrupted

• 128MB internal memory — stores up to 422,400 records when out of GSM coverage

• Over-the-air updates — firmware updatable remotely via FOTA Web

Driver Identification with Tracking Hardware UK 1-Wire Keypad

The FMC125 supports 1-Wire connectivity and is fully compatible with the Tracking Hardware UK 1-Wire driver identification keypad. Drivers enter their unique PIN at the start of each trip and the driver ID is logged alongside all GPS and telematics data — giving fleet managers complete driver accountability across professional fleet deployments. Contact us to discuss keypad and FMC125 bundle pricing.

FMC125 vs FMB125 — Which Should You Choose?

The FMC125 and FMB125 share the same dual SIM, RS232/RS485, 1-Wire, Bluetooth and CAN adapter capabilities. The single difference is network technology — the FMC125 uses 4G LTE Cat 1 for faster data and future-proof network compatibility, while the FMB125 uses 2G GSM. For new professional fleet deployments in the UK, the FMC125 is the recommended choice. The FMB125 remains a cost-effective option for stable 2G coverage areas and shorter deployment horizons.

Technical Specifications

Cellular: 4G LTE Cat 1 with 2G GSM fallback

GNSS: GPS, GLONASS, Galileo, BeiDou, SBAS, QZSS, DGPS, AGPS — less than 2.5m accuracy

SIM: Dual SIM

Bluetooth: 4.0 BLE

Serial interfaces: RS232 and RS485

1-Wire: Temperature and iButton

Power input: 10V to 30V DC

Backup battery: 170mAh Li-ion

Memory: 128MB — up to 422,400 records

Operating temperature: -40°C to +85°C

Typical Use Cases

Ideal for heavy duty fleet management requiring professional RS232/RS485 sensor connectivity, international logistics with cross-border roaming using dual SIM, refrigerated transport with 1-Wire temperature monitoring, fuel management using digital LLS fuel level sensors, car sharing and car rental requiring remote control and RFID, driver identification programmes, Teltonika ADAS camera integration and any professional fleet application requiring future-proof 4G connectivity with advanced serial interface support.

Frequently Asked Questions

What is the difference between the FMC125 and the FMB125?

The FMC125 and FMB125 are identical in features — same dual SIM, RS232/RS485, 1-Wire and Bluetooth. The FMC125 uses 4G LTE Cat 1 for faster data and future-proof network compatibility. The FMB125 uses 2G GSM. For new UK deployments the FMC125 is the recommended choice.

What devices can I connect via RS232 and RS485?

Digital fuel level sensors, Garmin navigation devices, RFID readers, barcode scanners and other third-party serial devices. This makes the FMC125 ideal for fleets needing data beyond basic GPS location.

Is the FMC125 compatible with the Tracking Hardware UK 1-Wire driver identification keypad?

Yes — the FMC125 supports 1-Wire and is fully compatible with the Tracking Hardware UK 1-Wire driver identification keypad. Contact us for keypad and FMC125 bundle pricing.

Does the FMC125 support the Teltonika ADAS camera?

Yes — the FMC125 is one of the compatible trackers for the Teltonika ADAS camera, enabling advanced driver assistance and road safety monitoring alongside fleet tracking. Contact us for details on ADAS camera and FMC125 bundle pricing.

Can I buy the FMC125 in bulk from Tracking Hardware UK?

Yes — we supply telematics service providers, fleet operators and resellers across the UK and internationally. Volume pricing and trade accounts are available. Contact us for a bulk quote.