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2 Jan 2024

Navigating the PSTN, ADSL, and EFM switch-off in the UK: A guide to smooth transition

PSTN*, ADSL**, and EFM*** networks are going to be switched-off. As traditional networks phase out, organisations need to understand the implications and take proactive steps to ensure seamless transition to newer, more advanced technologies. 

The decision to retire the PSTN, ADSL, and EFM networks stems from the necessity to embrace more modern and efficient technologies. These older 'copper line' networks, which have been the backbone of telecommunications for decades, are gradually becoming outdated and inefficient to maintain. As a result, the UK is moving away from copper-based products towards IP-based services, such as VoIP (Voice over Internet Protocol) and fibre-optic networks, which offer higher reliability, faster speeds, and a broader range of features. 




Warning: The switch-off date varies by postcode

The switch-off will happen gradually across the UK and has already started. BT Openreach no longer offers new PSTN-based services. You can continue using pre-existing legacy PSTN services until the complete switch-off on 31 January 2027.

However, the date when your local copper network is switched-off will depend on your postcode. It may happen before January 2027. To discover the estimated date, email your postcode to

Impact on organisations

This switch-off will impact both residential and business users who still rely on these traditional networks for their phone and internet services. Many alarm systems, payment terminals, and other devices that utilise landlines will need to be upgraded or replaced. For businesses, the potential disruption to operations could be significant if not addressed in a timely manner. 

Steps to prepare

Assess your current services: Begin by identifying the services that rely on PSTN, ADSL, or EFM. This could include phone lines, fax machines, broadband connections, security systems, etc. Evaluate which services need to be upgraded or replaced. 

Contact your service providers: Reach out to your service providers to understand how the switch-off will affect your services. Inquire about alternative options, upgrade possibilities, and timelines for the transition. 

Explore alternative solutions: Consider migrating to modern alternatives like VoIP for phone services and fibre-optic broadband. Explore the available packages, compare prices, and identify the solutions that best suit your needs. 

Upgrade equipment and systems: Replace or upgrade any devices or systems that rely on the old networks. This may include alarm systems, POS terminals, and any other equipment that operates using traditional landlines. 

Plan for contingencies: Anticipate potential disruptions during the transition period. Have contingency plans in place to ensure minimal disruption to your business operations or personal communication. 


The upcoming switch-off of PSTN, ADSL, and EFM networks marks a significant transformation in the UK’s telecommunications landscape. It’s very similar to the switch to digital television, and like then you need to be ready. It's crucial for businesses to take proactive steps to prepare for this transition. The date for the switch-off varies by postcode, and although BT plans to complete the work by 31 January 2027, your local copper network may go dead before that date.

Embracing modern technologies and understanding the impact on existing services will be pivotal in ensuring a smooth and seamless shift to the new communication infrastructure. By assessing your current setup, engaging with service providers, exploring alternatives, and upgrading where necessary, you can confidently navigate this transition and ensure uninterrupted communication and connectivity. 

As the old gives way to the new, staying informed and prepared will be the key to a successful transition into the future of telecommunications in the UK. 

* PSTN (Public Switched Telephone Network)
** ADSL (Asymmetric Digital Subscriber Line)
*** EFM (Ethernet in the First Mile)

Nathan Charles

By Nathan Charles