Is your business ready for the 2027 phone line switch-off?

If your business still makes calls over a traditional phone line, you’ve probably heard something about the “big switch-off” — and you might be wondering whether it actually affects you, and when. Here’s the plain-English version.

What’s actually happening

BT is retiring the UK’s analogue phone network — the PSTN (public switched telephone network) and ISDN lines that have carried voice calls for decades. Openreach stopped selling new PSTN and ISDN lines some time ago, and full switch-off is expected across the country by the end of 2027, with many local exchanges migrating well before that date.

In practice, this means every business still using a traditional phone line — whether that’s a simple analogue handset or a larger ISDN-based phone system — needs to move to a VoIP-based alternative before their local exchange switches over.

Why it’s happening

The UK’s phone network runs on ageing copper infrastructure that’s increasingly expensive to maintain, and it’s being replaced by full-fibre broadband anyway. Rather than run two networks in parallel indefinitely, providers are consolidating voice services onto the same fibre infrastructure that already carries broadband — which is what VoIP (voice over IP) does.

What you need to do

The good news is that migrating to VoIP is usually more straightforward than businesses expect, and it comes with genuine upgrades over a traditional line — call recording, hunt groups, and the ability to answer your business number from a mobile or laptop, not just a desk phone.

• Check whether your local exchange has an announced switch-off date
• Confirm what phone system you’re currently running, including any equipment that might need replacing
• Plan number porting in advance so your business number carries over without a gap
• Test call quality on your existing broadband connection before switching everything over

Don’t leave it until the last minute

Exchanges are being migrated on a rolling basis, not all at once — so “2027” isn’t a single deadline, it’s a range of dates depending on where you are. Businesses that leave migration until their exchange is imminently switching often end up rushed, whereas planning ahead means the whole process can happen on your schedule, not a provider’s.

If you’re not sure where your business stands, get in touch and we’ll check your exchange status and talk you through what a migration would actually involve.