Copper's Last Call: What the UK Phone Switch-Off Actually Means for Your Home

There is a small plastic box on the wall in millions of British homes that has done nothing more exciting than ring during dinner for forty years. It is now on borrowed time.

The old analogue telephone network — the copper wires that have carried voice calls since the Victorian era — is being retired, and calls are moving onto broadband instead. This is not a scare story doing the rounds on Facebook; it is a real, scheduled change with a deadline attached. For most households it will be a straightforward swap. For a few — people with care alarms, burglar alarms, or a broadband line that drops every time it rains — it needs a bit of thought first.

Here is the jargon-free version.

What is actually being switched off

The network has a technical name, the PSTN, but everyone in the industry just calls it copper. Rather than replacing one wire with another, the plan is to move calls onto the internet — a system called Voice over Internet Protocol, or VoIP. You will see it sold as Digital Voice, Cloud Voice, or something similarly breezy on the side of a van.

In practice, your phone plugs into your broadband router rather than the little socket on the skirting board. Your number usually comes with you. You can keep the handset if you are attached to it. What changes is the plumbing behind the scenes.

New copper lines have been closed to orders for a while now, and the remaining ones are due to be retired by the end of January 2027. If you have not had a letter, an email or a knock at the door yet, chances are you soon will.

The power cut problem

The old landline had one genuinely brilliant feature: it drew its power down the phone line. When the lights went out in a storm, the phone still worked. That is why so many people kept one.

Digital phones do not do that. They need mains electricity for the router and the handset. No power, no call.

The regulator, Ofcom, has rules about this. Providers have to offer a backup arrangement — often a battery unit or a mobile-based fallback — that keeps the line going for at least an hour during an outage, and they have to make sure you can still reach the emergency services. Ask for it in plain terms rather than assuming it will turn up in the post, and ask whether the battery is free, who replaces it, and how often.

Three things people forget

Burglar alarms. Monitored alarms, intruder alarms and many commercial systems use the phone line to signal out. Most need a digital-compatible replacement or a SIM-based unit. Ring your alarm company before the switch, not after.

Telecare pendants. If a relative wears a fall alarm from the council or a private provider, that device may be relying on copper. This is the single most important phone call on your list. Ask what their migration plan is and get it in writing.

Extension sockets. The one wired through the loft into the spare room is copper too. After the switch, only phones connected to the router — directly or through a base station — will work.

If your broadband is not up to it

This is the part that matters most outside the big cities. The whole plan assumes you have a working broadband connection, and some rural lines are a 2 Mbps miracle that gives up in a gale.

If that is you, ask about full fibre, fixed wireless, or a 4G or 5G router as a stopgap. Social tariffs exist for people on certain benefits, and they are cheaper than most people expect. What you should not do is let a salesperson sign you up to a digital voice service running on a connection that cannot carry it.

Questions worth asking your provider

• Will my phone work in a power cut, and what backup are you giving me — free or paid?
• Is the backup battery mine to replace, and how often?
• Can I keep my existing number, and will it move across cleanly?
• What happens to my broadband if I decline your digital voice service?
• Am I paying more, less, or the same once the switch is done?
• Do you support my care alarm, burglar alarm or fax machine?
• What speed will I actually get, and what is the plan if it is too slow?
• I have no mobile signal here — what is my emergency fallback?
• Can I delay the switch, and until when?

Write the answers down. If a call handler cannot answer one of them, ask to be put through to someone who can.

If you are not ready

The deadline is real, but it is not a cliff edge you fall off at midnight. Providers can defer a switch, particularly for vulnerable customers or where a care alarm has not yet been migrated, and Ofcom expects them to have protections in place rather than leaving people cut off.

A word of caution on the door-to-door side: nobody from Openreach will knock and ask to come in and inspect your phone line. If someone does, shut the door and ring your provider on a number you have looked up yourself.

The short version

Copper is going, and the replacement works perfectly well for the vast majority of homes. The people who get caught out are the ones who find out about it late. Do three things this month: find the number for whoever supplies your alarm, work out whether your phone needs a plug socket to survive, and put the questions above to your broadband provider before they put them to you.