If you are a business owner who still relies on a traditional phone line, there is an important change coming that you cannot ignore. By the end of 2027, the UK will fully switch off PSTN and ISDN phone lines. For many businesses, this could affect more than just desk phones.
To help break it down in a clear and simple way, we sat down with Jacob Olsberg, Lead Generation and Sales Executive at Alfonica, to talk about what the switch off really means and why now is the right time to start planning.
What is the PSTN and ISDN switch off and why should businesses care
In simple terms, the old copper phone lines that many businesses still use are being retired. They will be replaced by modern digital services that run over the internet. While 2027 may sound far away, Jacob explains that leaving it too late can create real problems.
What happens if businesses wait until the last minute
Q. If a customer waits until late 2026 to switch, what is the biggest problem they will face and why should they act now?
Jacob says timing is the biggest risk.
“As we get closer to the switch off, we expect a huge increase in demand. That means longer waiting times for engineers, possible shortages of equipment, and a higher chance of delays. If a business leaves it too late, they could face downtime simply because everyone is trying to move at the same time. Acting earlier gives businesses control and peace of mind.”
In short, planning ahead helps avoid stress, disruption, and rushed decisions.
It is not just desk phones that are affected
Many businesses assume the switch off only impacts their phones. That is not always the case.
Q. What are the hidden systems that still rely on old phone lines, and how can businesses find them?
“Desk phones are the obvious one, but there are often other systems running quietly in the background,” Jacob explains. “Things like alarms, lift lines, red care systems, and payment machines can still be using these old lines.”
So how do you find them.
“The best starting point is your bills. If you have these systems, you are paying for them somewhere. At Alfonica, we help customers uncover this through our Bill Check service. It helps identify what is connected, what it costs, and what needs to change.”
This step alone often highlights risks businesses did not even realise they had.
Why moving to digital systems is a positive change
The switch off is not just about avoiding problems. It is also an opportunity to improve how your business communicates.
Q. What can new digital systems offer that old phone lines could not?
Jacob highlights flexibility as a major benefit.
“Modern systems like VoIP allow you to work from multiple locations without being tied to a single office. Features that businesses used to pay extra for, like caller ID, call waiting, and voicemail, are usually included as standard. In many case, these systems turn out to be way cheaper than the traditional phone setting.”
For businesses with remote teams, multiple sites, or plans to grow, this flexibility can make a real difference straight away.
Final thoughts for business owners
Jacob’s advice is simple.
“Do not wait until you are forced to act. The earlier you start the conversation, the more options you have. It is about protecting your business today and setting it up properly for the future.”
If you are unsure whether your business is affected or want help understanding what to do next, starting with a review of your current setup is a smart first step. The 2027 switch off is coming, but with the right planning, it does not have to be a disruption. Book a free no obligation call with a specialist here.
