By January 2027, the UK’s Public Switched Telephone Network (PSTN) will be permanently retired – marking one of the biggest infrastructure changes in recent decades. For decades, PSTN lines have been the backbone of voice calls, alarm signalling, and data transmission across homes and businesses. However, as technology evolves, these analogue systems are being replaced with fully digital services delivered over broadband.
For many businesses and individuals still using PSTN auto dialers or alarm systems dependent on fixed phone lines, this change presents both challenges and opportunities.
What the PSTN Switch-Off Means
Once the switch-off is complete, any devices relying solely on PSTN – including traditional PSTN voice diallers, intruder alarms, lift emergency phones, or monitoring systems – may no longer operate as expected. While broadband-based VoIP systems will handle regular phone communication, not all legacy devices can adapt easily.
You will need to speak to your telephone provider and let them know that you have PSTN equipment that you need to continue to use. They may have to configure the line, provide you with a router with a PSTN port and in some cases, provide temporary adaptors to keep older devices functioning. However, they are not a long-term or reliable solution. Power cuts, network delays, and compatibility issues can interrupt the transmission of critical alarm signals and mean the equipment wont work – something no business or property owner wants to risk.
A Future-Proof Alternative: The 4G GSM Dialler
Many customers are already choosing to upgrade to our GSM auto dialler, a modern, future-proof alternative that offers robust, reliable performance without relying on fixed-line connections. Operating on the mobile network, GSM diallers send alerts and notifications using 4G technology – ensuring continuity, even after PSTN lines are decommissioned.
The system provides clear, instant communication with multiple contact numbers, allowing property owners, facilities managers, or security teams to respond quickly to alarms or emergency triggers.
Our GSM voice dialer also offers added flexibility, integrating with a wide range of control panels, sensors, and systems for security, monitoring, and automation applications.
Supporting Smart and Connected Solutions
The digital transformation of UK communications isn’t just about replacing what already exists – it’s an opportunity to enhance how devices interact. At Keystone Electronics, we offer a growing range of smart and wireless products designed to complement your systems.
From WiFi motion sensors that detect movement and trigger alerts, to WiFi water leakage sensors that prevent costly damage, these modern devices help create safer, more efficient environments. Combined with our 4G GSM diallers, they form part of a connected ecosystem that keeps you informed and in control – wherever you are.
For those developing or upgrading existing systems, our range of low cost 433 MHz transmitters and receivers and low cost 868 MHz transmitters and receivers also provides reliable solutions for short-range wireless communication, ideal for automation, alarm, and remote monitoring projects.
Preparing for the Change
The 2027 PSTN switch-off may still seem a little way off, but forward-thinking businesses are acting now to ensure a smooth transition. Upgrading to digital-ready equipment like GSM diallers helps future-proof your systems, avoiding downtime or costly last-minute replacements.
At Keystone Electronics, we’re here to support you through every step of the transition – providing expert advice, reliable technology, and trusted communication solutions that keep your systems connected in a digital world.