3G and PSTN Switch Off Ireland. What Every Irish Business Needs to Do Before the Deadlines Arrive
On 1 October 2026 Ireland's 3G mobile network is being switched off.
Any device still running on 3G will stop working. Any business alarm, card terminal or communication system that relies on 3G connectivity will need to have been upgraded before that date.
The 3G switch-off is not the end of the story. It is the most visible sign yet that Ireland's legacy telecommunications infrastructure is being retired, and that the traditional copper phone lines that most Irish businesses still rely on are following the same path.
Ireland's 3G network switch-off on 1 October 2026 is a fixed deadline. It is happening regardless of whether businesses are ready for it. And for the Irish businesses that have not checked whether their systems still rely on 3G, that deadline is arriving very quickly.
The copper phone network retirement is different. Unlike the 3G switch-off, there is no single national date. Ireland's PSTN and ISDN copper telephone network is being retired exchange by exchange, region by region, as the fibre network rolls out. There is no date to put in the diary. There is no single notice that arrives for every business at the same time.
That is precisely what makes it dangerous for Irish businesses.
The 3G PSTN switch off in Ireland is a clear, unavoidable deadline that forced action. The copper retirement is a rolling process that makes it easy to believe your area has not been reached yet. Until your phone line stops working and you discover it has been.
What Is Actually Being Switched Off
For clarity, there are two separate but related things happening to Irish telecommunications infrastructure right now.
The 3G network switch-off on the 1st of October 2026
Ireland's 3G mobile network is being decommissioned on 1 October 2026. Devices that only support 3G, older mobile phones, some alarm systems, some card payment terminals, some emergency call devices, will stop being able to connect to the mobile network after this date.
For most Irish businesses, the practical impact will be limited if mobile devices have already been upgraded to 4G or 5G. But businesses with older alarm systems, lone worker devices, CCTV systems or card terminals that still connect over 3G need to have acted before 1 October.
The copper telephone network retirement is rolling
Ireland's PSTN and ISDN copper telephone network is being retired as part of a national infrastructure modernisation programme. Eircom signalled this intent formally in 2021. ComReg has published the regulatory framework for the transition. The process is underway.
When a local exchange reaches a threshold of fibre coverage, the copper services running through that exchange begin the process of being retired. Industry receives 12 months notice before switch-off. Individual businesses in the affected area then need to migrate before their service is discontinued.
The critical point for Irish businesses:
There is no single national date. Your area may already be in the migration process. Or your notice may arrive in the next 12 months. Or it may be further away. But it is coming, and the businesses that act before the notice arrives have significantly more time, choice and control over the process than those who wait for it.
What Your Business Might Have That Relies on These Networks
Before acting, it is worth understanding everything your business has that may be affected. Many Irish businesses are surprised by how many systems run on infrastructure they were not aware of.
• Traditional PSTN phone lines: the standard landline phone in most Irish businesses and the line that ADSL broadband runs over
• ISDN lines: higher-capacity digital lines that many Irish businesses installed for multi-line phone systems and data
• PBX phone systems: on-premises hardware that manages internal and external calls, typically connected to ISDN
• Business alarms: many commercial security systems in Ireland still use PSTN lines to communicate with monitoring centres
• Lift phones: emergency phones in lifts that are frequently connected via copper phone lines
• Card payment terminals: some older terminals still connect over PSTN or 3G rather than broadband
• Fax machines: still in use in some Irish professional services, healthcare and public sector offices
• CCTV systems: some commercial CCTV systems use mobile data to transmit footage, which may be 3G
Not every business will have all of these. But most Irish businesses will have at least one system they have not yet thought about in the context of the copper retirement.
The Cost of Waiting for 3G PSTN switch off Ireland
The businesses that migrate to VoIP before the copper retirement reaches their area do so on their own terms. They choose the right system for their operation, migrate at a manageable pace and start seeing the cost savings immediately.
ISDN line rental has increased significantly in Ireland as providers prioritise their new fibre networks. Irish businesses still on traditional lines are paying substantially more for a service that is less reliable and has a fixed end date, while modern VoIP systems typically cost considerably less per user and offer significantly more functionality.
The businesses that wait do not save time. They lose it.
When the retirement notice arrives for your area, you have 12 months. That sounds like plenty of time. In practice, 12 months that includes Q4 trading, summer, staff holidays and every other operational priority your business carries is not as much time as it sounds. The businesses migrating now are the ones doing it on a schedule that suits them.
What Irish Businesses Are Switching To
The good news is that the alternative to traditional phone lines is significantly better in almost every respect.
Cloud VoIP phone systems
A cloud VoIP system runs entirely over your broadband connection. No physical PBX hardware. Calls managed through a hosted platform that your team accesses through desk phones, laptops or mobile apps. Your team can make and receive business calls from anywhere, the office, home, a client site, on any device.
VoIP systems include features that traditional phone lines simply cannot offer: auto-attendant and call routing, voicemail to email, call recording, Microsoft Teams integration, video conferencing and the ability to add or remove lines instantly without an engineer visit.
SIP trunks
If your business has existing PBX hardware and you are not ready to move to a fully cloud-based system, SIP trunks connect your existing infrastructure to the internet, replacing ISDN lines while keeping the hardware you already have in place. It is a cost-effective migration path for businesses that have invested significantly in their phone infrastructure.
One Thing to Sort Before You Switch
VoIP quality depends entirely on the quality of the broadband connection it runs over. A business that moves to VoIP without first ensuring its broadband is adequate will find that the call quality problems it experiences are a broadband problem, not a VoIP problem.
Before migrating your phone system, check that your broadband connection is business-grade, has sufficient upload speed for the number of simultaneous calls your business makes, and has a proper SLA that guarantees response times if something goes wrong.
If your broadband needs upgrading alongside your phone system, doing both at the same time, through a single provider, is significantly simpler than managing them separately.
What to Do This Week
Three things worth doing before the end of September:
• Check whether any system in your business still connects via 3G, alarms, card terminals, lone worker devices, CCTV and confirm it has been or is being upgraded before 1 October
• Call your current telephone provider and ask whether your local exchange has entered the copper retirement process, and if so, what your migration timeline is
• Talk to Fastcom about what moving to VoIP looks like for your business, the right system, the right broadband connection and a migration plan that does not disrupt your operation
Talk to Fastcom about switching your business phone system.
We help Irish businesses move from traditional phone lines to modern VoIP systems, cloud-based, flexible, significantly cheaper and built for the way Irish businesses communicate in 2026. Irish-based support. No obligation.
Visit fastcom.ie or call our team today on +353 818 70 71 71
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