3G switch off

Chris Burroughs, Director of Unified Support on the 3G Switch Off, what It means for building communications and how to prepare for the changes

The UK’s mobile network landscape is undergoing a seismic shift. As mobile operators progressively retire 3G networks, facilities managers across the country are being urged to take stock of how this transition will affect communications within their buildings. From security systems to lift emergency phones, many of the technologies that quietly underpin day-to-day operations could be at risk of going silent if not upgraded or adapted.

In this feature we’ll examine the implications of the 3G switch-off, how it will disrupt communications infrastructure in commercial and residential buildings, and how the adoption of Ofcom-compliant mobile signal repeaters can provide a robust and future-proof solution by enhancing 4G and 5G coverage.

THE END OF 3G

Mobile network operators including Vodafone, EE, Three and O2 have begun the phased retirement of their 3G services, with all 3G services to be switched off by the end of 2025. The rationale is clear: 3G is inefficient compared to newer technologies. The spectrum it occupies can be repurposed for faster, more reliable 4G and 5G services.

However, while consumers with modern smartphones might not notice the shift, many building systems still rely heavily on 3G connectivity. These include:

• Building management systems (BMS).
• Fire and intruder alarm monitoring.
• Lift emergency call systems.
• Remote-controlled HVAC systems.
• Smart meters and IoT devices.

If these systems are 3G-dependent, they may cease to function reliably, or at all once the network is decommissioned.

HIDDEN THREAT TO CRITICAL INFRASTRUCTURE

One of the core issues is that many devices installed over the past decade used 3G as a reliable middle-ground technology. Unlike 2G, which has lower bandwidth, or 4G/5G, which weren’t widely adopted in older equipment, 3G offered a balance of coverage and speed. Now, buildings may be hosting dozens of embedded systems that are suddenly unsupported.

This raises serious safety, compliance, and operational concerns. For example:

• Lift alarms may not connect to emergency services.
• Security systems could lose real-time monitoring capabilities.
• Remote diagnostics for plant equipment could fail, increasing the risk of downtime.
• Residents in high-rise buildings might find mobile phone signal patchy or unavailable indoors.

Replacing legacy systems can be time-consuming and costly. Even devices capable of operating over 4G or 5G may struggle to maintain a signal indoors due to the construction materials commonly used in modern buildings – steel, concrete, and energy efficient glazing all block mobile signals to some extent.

THE ROLE OF OFCOM-COMPLIANT MOBILE REPEATERS

This is where Ofcom-approved mobile signal repeaters come into play. These devices legally and safely amplify indoor mobile signal, ensuring that 4G and 5G coverage penetrates throughout a building, even into traditionally difficult areas like basements, stairwells, and lifts.

Unlike illegal or unregulated boosters, which can cause network interference and attract fines, Ofcom-compliant repeaters are authorised for use and designed to meet strict performance and safety standards.

Benefits include:

• Improved mobile signal indoors for all networks (depending on the model used).
• Seamless 4G/5G coverage in offices, residential blocks, retail centres, and industrial estates.
• Support for modern BMS and safety systems, many of which are now being manufactured with 4G/5G modems.
• Better occupant satisfaction through reliable voice and data connectivity.
• Minimal disruption installation, with many systems designed to be retrofitted without major works.

By ensuring solid mobile signal throughout the premises, facilities managers can provide a future-ready communications environment while avoiding the costs and complexities of full device replacement, especially where the issue is signal quality, not hardware obsolescence.

STEPS FACILITIES MANAGERS SHOULD TAKE NOW

• Audit your building systems: Identify all devices and systems that currently rely on 3G connectivity. Check manufacturer specifications to determine upgrade options or alternative compatibility.
• Assess indoor mobile coverage: Commission a signal strength survey to identify blackspots or poor-performing zones within your property.
• Consider repeater solutions: Engage with suppliers of Ofcom-compliant repeaters to explore how enhanced mobile coverage can support 4G/5G migration and future IoT installations.
• Plan for the future: As more building systems become connected via cellular networks, reliable indoor signal will be as essential as electricity or water.

DON’T GET LEFT BEHIND

The 3G switch-off is more than a mobile industry milestone, it’s a wake-up call for facilities management. With communications playing a critical role in safety, connectivity, and tenant experience, now is the time to evaluate your building’s readiness for a 4G/5G world.

Rather than waiting for systems to fail, proactive upgrades, paired with the strategic use of mobile repeaters, can ensure a smooth transition and maintain uninterrupted service across all aspects of your building.

Ofcom-compliant repeaters aren’t just a stopgap, they’re a long-term solution that turns a looming problem into an opportunity for smarter, more resilient facilities.