PSTN Switch-Off 2027:
What UK Businesses Need To Do
Before 31st January
Every business still running a traditional phone line must migrate before the switch-off date, or lose service entirely. Find out what it means, what stops working, and how to keep your number.
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95 Days Until The PSTN Switch-Off
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Your Central Hub For The PSTN And ISDN Switch-Off
Whether you're just learning about it or ready to migrate, use the links below to find what you need. The switch-off affects every UK business still on a traditional copper phone line, and the deadline is fixed.
PSTN switch-off guide
What it is, who's affected, what stops working, and how to prepare.
Get the GuideWhat happens to my phone line on 31st Jan 2027?
Plain-English answers to the most-searched questions.
Read the FAQsISDN switch-off: what it means and what to do
ISDN and Featureline are included. Find out what changes.
Learn MorePSTN switch-off checklist for small businesses
A quick self-audit to see where you stand.
Get ChecklistHow To Keep Your Business Number After The PSTN Switch-Off
Switch-Off Ready
Migrate Safely Before January 2027
Installation
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Price guarantee
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Double billing
We cover the overlap
Your number
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Frequently Asked Questions
BT confirmed 31 January 2027 as the hard switch-off date. Openreach stopped selling new PSTN and ISDN lines on 5 September 2023. No new connections are possible, migration is the only option.
If you're still on a PSTN or ISDN line and haven't migrated by 31 January 2027, your phone service will stop. VoIP and SIP lines are not affected — only copper-based PSTN and ISDN connections.
You can port your existing number to a VoIP service before the cut-off. TTNC handles the porting process end-to-end: your number moves across, your calls continue, and you keep the number your customers already know.
Most small business migrations complete within a few working days. TTNC handles all the technical steps, you don't need an IT team or specialist knowledge to migrate.
Free Downloads
Free PSTN Switch-Off Guide
Our guide covering everything a UK small business needs to do before January 2027.
Get Your CopyPSTN Readiness Checklist
A one-page audit you can run through with your team in under 10 minutes.
Download NowGet the free PSTN Switch-Off guide
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