How should telemetry products prepare for the UK’s 2G switch off?

Preparing telemetry products for the UK 2G switch-off starts with understanding which devices depend on the network, what their replacement connection must support and how upgrades will reach equipment already in service.

For manufacturers of trackers, remote monitoring systems and industrial controllers, this can involve changes to hardware, firmware and installation procedures. A different SIM alone cannot give a 2G-only modem the ability to communicate over 4G.

The practical task is to develop and validate an upgrade while there is still time to manufacture it, arrange access to installed equipment and support customers through the change.

Why the 2G switch off belongs in your product plan now

The UK’s 3G networks have already been switched off. Operators are now preparing to retire 2G, which remains relevant to older telemetry and machine-to-machine equipment.

As of October 2026, the announced plans are:

These timings come from the operators’ published guidance.

These are operator plans, and regional changes may happen earlier. Vodafone, for example, says some areas may retire 2G ahead of its 2030 timetable as part of a phased approach.

For a product expected to operate for years, the available preparation time needs to cover the whole migration. Engineering work is only one part. Component sourcing, prototype testing, production capacity and customer installation windows also affect when an upgrade can realistically be completed.

Some access arrangements have already changed. O2 began withdrawing inbound roaming access to its 2G network from 1 October 2025, affecting devices using international roaming SIMs. That makes it important to check the actual networks and services available through a connectivity provider.

Begin with an inventory of the installed products. Record the modem, hardware revision, firmware, SIM provider and operating locations. Identify equipment that uses 2G as its main connection and equipment that falls back to it when another connection is unavailable.

That inventory helps establish which products need replacement hardware, which may support a configuration change, and which require further investigation.

What to review beyond the modem and SIM

A successful 2G IoT migration starts with the service the product must deliver. How often does it send information? Does it move between locations? How quickly must it receive a command? Is it powered continuously or expected to run for long periods from a battery?

Different cellular options suit different requirements. LTE-M is designed for low-power IoT applications, while LTE Cat 1 bis is another 4G option worth assessing. NB-IoT may suit some applications sending small amounts of data. Selection should account for coverage, mobility, power consumption and support from the intended operators.

A fixed sensor sending occasional readings presents different demands from a vehicle tracker reporting throughout a journey. TAD’s guide to choosing IoT network solutions explores these wider trade-offs.

Once the technology is selected, review how the module fits the existing electronics. Check its supply requirements, connections and interfaces rather than assuming that a similar footprint makes it a direct replacement. Manufacturer migration guidance can require changes to the power supply, antenna and software even within a related product family.

The antenna needs to support the required frequency bands and perform in the finished installation. Assess it inside the enclosure, with the intended cables and mounting arrangement. An acceptable connection on an open bench is only an initial check.

Review the power budget across a complete operating cycle. Measure startup, network registration, transmission and sleep, including behaviour in poor coverage. Check that the supply can handle the chosen module’s current demands without pulling the rest of the product below its operating voltage.

Firmware also needs a review. Connection commands, response times, sleep behaviour and recovery procedures may change. Define how the device handles failed connections, stores readings during an outage and resumes communication without repeatedly restarting.

Pay particular attention to SMS. Some products use text messages for alarms, configuration or to trigger a data connection. Successful 4G data transmission does not establish that these functions will work. Confirm the required messaging support with the connectivity provider, including roaming arrangements, and test each function. GSMA has highlighted SMS continuity as a specific risk during the 2G switch-off and 3G retirement.

Planning a staged upgrade for products already in service

Use the inventory to group products by their engineering needs and the consequences of losing communication. A unit reporting occasional maintenance data may allow a different migration schedule from one supporting time-sensitive monitoring or control.

Decide whether each group needs a modem replacement, a revised PCB, an external communications unit or a complete product replacement. Include installation labour, access restrictions and remaining service life in that decision.

Then validate a representative pilot group. Include difficult locations and typical mounting arrangements, alongside sites with good coverage. For mobile equipment, test the routes and operating conditions that matter to the customer.

During those trials, confirm that devices are using the intended replacement network technology. A modem that quietly falls back to 2G can make an apparently successful pilot misleading.

Check the complete service. Readings should reach the correct customer account, timestamps should remain useful, alerts should arrive as expected and authorised remote commands should work. Test recovery after a power interruption or loss of coverage, as well as normal operation.

Agree acceptance criteria before expanding the rollout. Useful measures might include connection success, message delivery time, energy consumption and recovery behaviour. Record the hardware, firmware and connectivity configuration behind each result so production can reproduce the validated setup.

Installation teams need clear instructions too. Explain how to identify compatible units, fit the upgrade, confirm connectivity and prove that information has reached the monitoring platform. Update asset records as each device is migrated and retain a practical recovery option if an installation fails.

At TAD, bringing electronic design, firmware, prototyping and manufacturing together helps keep these decisions connected. A 2G to 4G migration can then be planned around the complete product, from the first hardware assessment through to repeatable manufacture and support for equipment in the field.

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FAQs

When is 2G being switched off in the UK?

The timetable varies by operator for the 2G switch-off. As of October 2026, EE plans to begin from May 2029, O2 from summer 2029 and Vodafone in spring 2030. Check the relevant operator and connectivity provider for updates, including regional changes and roaming restrictions.

Will changing the SIM make a 2G device work on 4G?

No, not if its modem only supports 2G. The radio hardware must support the replacement technology and frequency bands. Some products already have compatible hardware, but their firmware, configuration and connectivity arrangements still need checking.

Do telemetry products need 5G when 2G is switched off?

Not necessarily. Suitable 4G technologies can meet many telemetry requirements. The choice should follow the product’s coverage, mobility, data, power and service needs, with support confirmed for the countries and operators where it will be used.