Why Lift Emergency Call Systems Must Migrate to 4G GSM Before the UK PSTN Switch-Off
The UK’s telecommunications landscape is undergoing one of its most significant changes in decades. The Public Switched Telephone Network (PSTN) — the copper-based system that has carried voice calls across the country for more than a century — is being phased out in favour of modern digital communications. As of 31 January 2027, traditional analogue lines will no longer be supported, with the migration to digital and mobile networks largely complete by that date. This transition has profound implications for critical safety infrastructure — including lift emergency call systems, which historically have relied on PSTN lines to connect passengers to help in perilous situations.
The Safety and Compliance Challenge
Lift emergency communications are not optional extras — they are mandated safety systems under European and UK standards such as EN 81-28. These systems must provide a reliable, always-on path for trapped or injured passengers to contact emergency responders or remote assistance services. Most legacy lift emergency phones and auto-diallers were designed to work over analogue PSTN lines, which guarantee an always-on dial tone and, crucially, powered connectivity independent of mains electricity.
Once PSTN is retired, any lift still relying on a copper line will lose its emergency calling capability, potentially leaving passengers isolated and without recourse in critical moments. This not only creates a grave safety risk but also renders the lift non-compliant with safety regulations — potentially leading to regulatory action or even forced removal from service until remediated.
Why 4G GSM Is the Practical Replacement
A robust solution that many building owners and lift operators are now adopting is a 4G GSM-based emergency communication system. Unlike PSTN:
- No physical phone line is required. GSM modules communicate over mobile networks, which are already pervasive and well-established across the UK.
- Battery backup ensures resilience. Digital landlines and VoIP often need external power, leaving communications vulnerable during outages. 4G GSM emergency units typically include internal batteries, meaning they remain operational even in a power cut.
- Future-proof connectivity. With the PSTN gone and older networks like 3G already phased out, 4G remains widely supported — and can be further future-protected with roaming multi-network SIM integrations and remote monitoring services.
- Regulatory compliance. GSM solutions can be configured to meet emergency system standards and support test call monitoring, fault alerts, and automatic escalation processes.
In many cases, the upgrade to a 4G GSM solution is also cost-effective compared with maintaining ageing PSTN infrastructure or attempting to retrofit analogue adapters onto digital networks — the latter of which can be unreliable or unsuitable for safety-critical systems like lift alarms.
Mitigating Risks Before 2027
Although the formal switch-off deadline is January 2027, telecom providers have already started migrating customers away from PSTN, meaning some systems may fail well before the deadline. Operators and facilities teams should therefore act now — auditing lift communication systems, planning upgrades, and engaging with technology partners to ensure continuity of service.
Waiting too long not only exposes lifts to safety and compliance issues but also risks increased costs and supply bottlenecks as the deadline approaches and demand for digital-ready solutions spikes.
Conclusion
The UK’s PSTN switch-off is more than just a technical shift in how phone calls are routed. It’s a landmark change that affects a wide range of services that depend on reliable, always-on connectivity — and lift emergency call systems are among the most critical of these. Upgrading to a 4G GSM-based solution ensures that lifts continue to provide safe, compliant emergency communications long after copper phone lines have disappeared from the UK’s networks.
Cloud Telecom Services Ltd, designers of the 4G GSM Gateway and Auto dialler for lift operators
