For decades, the old copper phone line had one quiet advantage: it kept working when the electricity went off. That is changing. The UK’s analogue phone network is being retired, and the digital landlines replacing it need mains power. Most households can fall back on a mobile. But if you live somewhere rural with weak or no mobile signal, a power cut could leave you with no working phone at all.

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What is changing, and when

The analogue network is called the PSTN (Public Switched Telephone Network). BT and Openreach plan to switch it off by 31 January 2027 (Ofcom; Openreach). The original target was the end of 2025, but the industry pushed it back to January 2027 (BT Group, May 2024; GOV.UK).

Your phone plugs into your broadband router instead of the wall socket. BT calls its version Digital Voice, Most people keep their number, and BT says it contacts customers at least four weeks before their switch date (BT). Virgin Media O2 and KCOM are retiring their own analogue networks too, but have not yet set dates (Ofcom).

Reply when your provider contacts you. Openreach says anyone not switched by the deadline may be moved to a temporary emergency voice-only service (Openreach).

Why power cuts matter more in the countryside

Ofcom is clear: digital landlines need mains electricity and will not work in a power cut unless there is a battery backup (Ofcom).

In a town you pick up your mobile instead. In a rural home it can be serious:

  • No signal indoors. Stone walls, hills and distance from the mast can block it.
  • Longer outages. Storms often hit rural power lines hardest, and repairs take longer to reach.
  • Telecare and alarms. Pendants and alarms on the old line need checking first (GOV.UK).

One reassuring fact: if your own network has no signal, a 999 call from a mobile will automatically use another network if one is available (Ofcom). But that only helps if some network reaches you.

Step 1: Ask your provider about free battery backup

If you rely on your landline and do not have a working mobile phone or reliable mobile signal, your landline provider must offer you a free backup solution, such as a battery backup unit. It has to keep you able to call the emergency services for at least one hour in a power cut, and Ofcom notes that some providers’ backups last up to seven hours (Ofcom).

Under the government’s PSTN charter, the major providers have also committed to work towards backup solutions that go beyond Ofcom’s one-hour minimum (GOV.UK). In 2024, BT said it gives free battery backup units to customers with additional needs, including those with health pendants, people over 70 and people without mobile coverage (BT Group).

Phone your provider, say you have poor or no signal at home, and mention anyone elderly, vulnerable or using telecare. If you are not eligible for a free unit, you can buy one from your provider or a retailer (Ofcom).

Step 2: Check your real mobile coverage

Ofcom’s Map Your Mobile checker shows predicted 4G and 5G coverage for each of the four main networks at your postcode, both outdoors and indoors.

It is a prediction, so test outside with your phone too. If another network shows a bar or two where yours shows nothing, switching network may be the cheapest fix.

Step 3: Turn on Wi-Fi calling, and know its limit

Wi-Fi calling lets your mobile make and receive normal calls and texts over your broadband, even with no mobile signal. EE, O2, Three and Vodafone all offer it on compatible phones, and it uses your usual call allowance (EE; O2).

But it needs your router and broadband working. Vodafone warns that a Wi-Fi call, including a 999 call, may end if there is a power cut or your Wi-Fi fails (Vodafone).

Step 4: Bring outdoor signal indoors with a booster

If you have some signal outside but lose it indoors, a mobile signal booster can help. An outdoor antenna picks up the existing signal, the booster amplifies it, and an indoor antenna rebroadcasts it inside. Your phone then uses the mobile network directly, with no router involved.

Be realistic: a booster cannot create signal from nothing. If there is no usable signal anywhere outside your home, a booster will not help, and battery backup plus your provider’s support are the right route. Our guide Do Mobile Phone Boosters Work in Rural Areas? explains how to tell.

For rural homes, kits that support the lower frequency bands are worth a look, so check which bands your network uses at your address before you buy. Three kits from our range (prices at the time of writing):

Not sure which fits? Message us through the chat box with your postcode and network, and we will point you to the right kit.

Step 5: Keep it all running with a backup battery or UPS

A booster runs on mains power too, so in a power cut it switches off like your router. The fix is a small backup battery or UPS (uninterruptible power supply). Plug the booster, router and cordless phone base into it.

Choose one rated for the combined wattage of everything plugged in; longer runtime needs a bigger battery. Government guidance notes that battery backup units can typically power a broadband router for around four to seven hours, depending on the equipment (GOV.UK). Keep a charged power bank for your mobile as well.

Masts need power too, and providers use backup power and generators to keep them running (GOV.UK). No single fix is perfect, so layer them.

Frequently asked questions

When is the UK landline switch-off?

BT and Openreach plan to retire the analogue network by 31 January 2027. Virgin Media O2 and KCOM have not yet set dates for theirs.

Will my digital landline work in a power cut?

Not without a battery backup. Digital landlines need mains electricity, so the router and phone stop working when the power goes off.

Can I get a free battery backup?

If you rely on your landline and have no working mobile or reliable mobile signal, your provider must offer a free backup that lets you call the emergency services for at least one hour.

Will a mobile signal booster work if I have no signal at all?

No. A booster amplifies signal that already reaches the outside of your home. If there is no usable signal outside, it cannot help.

Does a signal booster work in a power cut?

Only if it has power. Plug it into a UPS or backup battery and it will keep running for as long as the battery lasts.

Mobile Booster UK. This guide is general information, not advice for your specific situation. Always speak to your phone provider about your switchover, battery backup and any telecare equipment.

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Shop mobile signal boosters

Get a stronger mobile signal at home or work. Delivery in 5-7 working days. 30-day returns.

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