Worst UK areas for mobile signal: is yours on Ofcom's list?

Written by (LinkedIn) • Reviewed by Adrian James (LinkedIn)

Last reviewed: 6 November 2026

Quick summary: West Devon came last and Watford top in Ofcom's 2026 mobile league. The top and bottom 10, every network's score, and how to fix poor signal at home.

Worst UK areas for mobile signal
Illustration: Worst UK areas for mobile signal: is yours on Ofcom's list

Poor mobile signal where you live? Here's where your area ranks in Ofcom's 2026 figures, and what fixes it at home

Which UK areas have the worst mobile signal? In Ofcom's 2026 figures, West Devon came last, with phones getting a good connection 68% of the time, and Watford came top on 88%. The bottom 10 are largely rural, and seven are in South West England. EE scored best at 85% and O2 lowest at 77%. If your signal is poor at home, turn on Wi-Fi calling today, check each network at your postcode, and make sure your broadband is good enough to carry your calls.

What it means for youChecked 5 November 2026

If your area is in the bottom 10: you're not imagining it. Check which network does best at your postcode before you sign another phone contract, and turn on Wi-Fi calling at home.

If signal is fine outside but poor indoors: Wi-Fi calling is usually the fix. It uses your home broadband, so the broadband needs to be reliable.

If you rely on a landline and have no mobile signal: tell your landline provider before the old phone network closes, due by 31 January 2027. You can ask for a back-up for power cuts.

Make your broadband carry the calls your signal can't

Wi-Fi calling only works as well as the broadband behind it. See every full fibre, cable, wireless and satellite option at your postcode, with the full contract cost.

  • ✓Every provider that reaches your address, side by side
  • ✓Full fibre, 4G, 5G and satellite in one search
  • ✓Free, independent, and your new provider handles the switch
Compare broadband at my postcode →

Prefer to talk it through? Call us on 0330 122 1223

Key facts, verified 5 November 2026

  • Ofcom's Mobile Matters 2026 found phones got a good connection 81% of the time across the UK, below its proposed 90% target (Ofcom, 16 October 2026).
  • West Devon scored lowest at 68% and Watford highest at 88%, and none of the 360 local authority areas reached 90% (Ofcom, 16 October 2026).
  • The bottom 10 were West Devon, North Devon, Cotswold, Malvern Hills, Somerset, Torridge, Tewkesbury, Shropshire, Cornwall and Gwynedd (Ofcom, 16 October 2026).
  • EE scored 85%, Three 82%, Vodafone 81% and O2 77% across the UK, and Vodafone came top in Northern Ireland (Ofcom, 16 October 2026).
  • England averaged 82%, Northern Ireland 81%, Scotland 79% and Wales 76%; rural areas averaged 75% against 82% in towns and cities (Ofcom, 16 October 2026).
  • 4G connections met Ofcom's bar 78% of the time, against 92% for 5G (Ofcom, 16 October 2026).
  • Ofcom's Map Your Mobile checker shows the same performance score, network by network, for your postcode district (Ofcom, 16 October 2026).
  • To switch mobile network and keep your number, text PAC to 65075; your network must send the code within a minute, and the switch must be done within one working day (Ofcom, checked 5 November 2026).
  • All nine networks and SIM brands we checked offer Wi-Fi calling, though Tesco Mobile limits it to pay monthly customers (BroadbandSwitch.uk check, 5 November 2026).
  • BT's analogue phone network is due to close by 31 January 2027, and Ofcom says a power-cut back-up should be free for people who depend on their landline (Openreach and Ofcom, checked 5 November 2026).

Who this is for: anyone whose phone drops to one bar at home, families choosing a network for a teenager's first contract, people working from home in the countryside, and anyone helping an older relative who relies on a landline. We'll follow Ruth, an example built from the calls we take, not a real customer. Ruth does the books for local farms from her cottage outside Okehampton in West Devon, and her phone only works by the kitchen window.

Which areas have the worst mobile signal in the UK?

Direct answer: West Devon, where phones got a good connection 68% of the time. North Devon came next on 69%, then Cotswold, Malvern Hills and Somerset on 70%. Ofcom's ten lowest areas are largely rural, and seven are in South West England.

Three of the bottom six are in Devon: West Devon, North Devon and Torridge. Cornwall, Somerset, and Cotswold and Tewkesbury in Gloucestershire make it seven from South West England. Malvern Hills and Shropshire are in the West Midlands, and Gwynedd is in north Wales.

Ofcom ranked 360 local authority areas, so even 72% puts Cornwall, Shropshire and Gwynedd in the bottom 10. ISPreview's report of the findings reproduces Ofcom's best and worst table if you'd like to see it.

For Ruth in West Devon, that 68% fits what she sees: a bar or two by the window, nothing in the back office, and video calls that freeze unless she's on Wi-Fi.

Where is mobile signal best?

Direct answer: Watford came top on 88%. Six London boroughs, Sutton, Islington, Waltham Forest, Southwark, Lambeth, and Barking and Dagenham, also scored 88%, with Hertsmere, Havering and Tamworth on 87%. Even the best areas fell short of Ofcom's 90% target.

Seven of the top 10 are London boroughs, and two more, Watford and Hertsmere, sit just outside London in Hertfordshire. Tamworth in Staffordshire is the only one further away.

Cities did well but not perfectly. Ofcom says selected inner-city areas ranged from 81% in Bristol and Edinburgh to 86% in London, according to its report. So if you're in a city and still struggle indoors, the building you're in may matter more than the postcode.

What does Ofcom count as a good connection?

Direct answer: A phone that connects and then gets at least 5Mbps download, 1.5Mbps upload and no more than 50 milliseconds' delay. Ofcom counts how often all of that happens, and has proposed a benchmark of at least 90% of the time.

This is the first year Ofcom has used this score in Mobile Matters, so there's no like-for-like comparison with last year. It's built from tests run by apps on people's phones, both Android and iPhone, collected by Opensignal between August 2025 and July 2026, more than 225 million data points in all.

It measures how well mobile data works, not signal bars or call quality, though for most people that's what good signal means. When scores fall short, Ofcom says it's usually because connections missed the 1.5Mbps upload or 5Mbps download thresholds, rather than being too laggy.

The 90% figure comes from Ofcom's Connectivity you can count on discussion paper in June, which, Ofcom's methodology says, proposed it for each network in each area. It is a proposal, not a legal rule.

One thing to bear in mind: Ofcom notes the data only relates to areas where there was mobile coverage. Our reading is that a spot with no signal at all produces few tests, so the worst not-spots may not show up in an area's score.

Which mobile network is best?

Direct answer: Across the UK, EE scored highest at 85%, then Three on 82%, Vodafone on 81% and O2 on 77%. EE led in England, Scotland and Wales, but Vodafone came top in Northern Ireland, and O2 dropped to 65% in Wales.

So the best network depends on where you are. In Northern Ireland, Vodafone's 83% beat EE's 82%. In Wales, the gap between networks was widest: EE on 82% against O2 on 65%. Ofcom says EE was the most consistent across the four nations.

These are averages for a whole nation, though. A network that does well nationally can still be weak in your valley, which is why the postcode check further down matters more than the league table.

Why is signal worse in rural areas and in Wales?

Direct answer: Mostly because rural areas and Wales rely more on 4G. Ofcom found 4G met its bar 78% of the time against 92% for 5G, and 82% of connection attempts in Wales were on 4G, compared with 75% in England.

Ofcom says people in all four nations had similar success rates when making a data connection. The difference was speed, and that came down to how often phones could use 5G. In towns, phones also tended to get faster connections than on the same technology in the countryside.

Local figures back this up in Devon. In July, Devon County Council's cabinet member for rural affairs and broadband said 5G coverage was 66% across Devon against more than 96% nationally, with West Devon at 63.3%, Torridge at 46.7% and North Devon at 45.2%.

The government's Wireless Infrastructure Strategy set an ambition in 2023 for standalone 5G to reach all populated areas by 2030. That is an ambition for 2030, so for poor signal at home today, Wi-Fi calling is the quicker fix.

Why does the map say I'm covered when my phone says no?

Direct answer: Because coverage maps predict signal, mostly outdoors, while Ofcom's performance score measures what real phones achieved. Thick walls, hills, busy masts and older 4G kit can all leave you struggling in a place a map shows as covered.

Ruth's postcode shows as covered by two networks. Outside, that's true. Inside her cottage, with thick stone walls, the signal drops to almost nothing, which no outdoor prediction will capture.

If that sounds like your home, the problem may be the building rather than the network. That's good news, because the fixes in the next sections, Wi-Fi calling and a legal booster, are aimed at exactly that.

How can I check mobile signal at my postcode?

Direct answer: Start with Ofcom's Map Your Mobile, which shows predicted coverage and the same performance score for each network in your postcode district. Then check the networks' own maps, ask neighbours which network works, and test with a cheap pay as you go SIM before committing.

Ofcom's Map Your Mobile is free to use. Ofcom says it uses the same performance score as Mobile Matters, so it gives you a local version of this league table for your postcode district. In May, Ofcom said a million people had used it.

Remember that SIM brands use the big four networks' masts. If Map Your Mobile shows O2 as strongest where you live, an O2-based brand such as giffgaff, Tesco Mobile or Sky Mobile should see the same coverage.

Our guide to the Shared Rural Network explains the new rural masts being built, and which network you're actually on helps if you're on a smaller brand.

Does Wi-Fi calling fix bad signal at home?

Direct answer: For most homes, yes. Wi-Fi calling sends your normal calls, and on most phones your texts, over your home broadband, using your usual number and no app. Every network and SIM brand we checked offers it, usually at no extra cost, but your phone has to support it.

This is our own check: we read each network's and brand's own help pages on 5 November 2026. EE says calls cost the same and don't touch your mobile data. O2 says it's included at no extra cost on pay monthly and should switch on by itself. giffgaff says there are no extra data charges.

The catches are in the small print. Tesco Mobile says pay as you go customers need to move to pay monthly to get it. Three says phones not bought from Three may not be compatible. Asda Mobile says new customers can use it seven days after activating.

To turn it on, look in your phone's settings. On an iPhone it's in Settings, under Phone (Apps, then Phone, on newer versions), then Wi-Fi Calling. On many Android phones it's in Settings, under Connections, or in the Phone app's settings. If you can't find it, your network's help pages explain it, for example VOXI, Vodafone and Sky Mobile.

Wi-Fi calling only works abroad if your network allows it, and several, including O2 and giffgaff, say it's UK only. It also stops when your broadband or power goes off, so it's a fix for everyday calls, not a back-up for emergencies.

Is your broadband good enough for Wi-Fi calling?

Wi-Fi calling needs very little speed, but it needs a steady connection. Run a free test in the room where you make calls.

Run the UK Speed Test →

What if my broadband isn't good enough for Wi-Fi calling?

Direct answer: Fix the broadband first, because it's now carrying your calls. Check for full fibre at your address, and if there's nothing decent, ask about your legal right to broadband or look at fixed wireless and satellite. 4G or 5G home broadband uses the same masts as your phone.

For most people the first step is quick: put your postcode into our comparison and see what reaches you. Full fibre was available to 82% of UK homes by January 2026, and it keeps spreading through Project Gigabit.

If nothing decent reaches you, the universal service obligation gives you a legal right to request a decent, affordable connection. Our guides to rural options when fibre isn't available and whether Starlink is good in rural areas cover the alternatives.

Home 4G or 5G broadband can be great where the masts are strong. In a bottom-10 area, though, it uses the same masts your phone is struggling with, so check the score for your postcode first, or ask whether an outside aerial can reach a better mast. Our 4G vs 5G home broadband guide explains the difference.

Are mobile signal boosters legal in the UK?

Direct answer: Some are. Under Ofcom's current rules, in force since 16 June 2022, you can fit certain indoor boosters yourself without a licence, if they meet its technical requirements. Ofcom calls boosters that don't meet them illegal devices that risk causing interference.

Ofcom's repeaters statement sets out the two types you can fit yourself: provider-specific repeaters and multi-operator repeaters, and says both may amplify more than one operator's frequencies. Both must meet Ofcom's technical requirements, and Ofcom says it won't endorse particular products.

So buy from a seller that says plainly the booster meets Ofcom's licence-exempt rules, and be wary of cheap boosters that don't. If you get some signal by a window, a legal booster can help. If there's nothing at all outside, Wi-Fi calling is the better fix.

How do I switch mobile network and keep my number?

Direct answer: Text PAC to 65075 from your phone. Your network must send your switching code within a minute, the code lasts 30 days, and your new network must complete the switch within one working day. To get a new number instead, text STAC to 75075.

Those rules come from Ofcom's text-to-switch guide. The reply also tells you about any early exit fees, so you can see the cost before you move. If you're still in contract, it may be cheaper to wait or to add Wi-Fi calling first.

Before you switch, test the new network where you live with a cheap pay as you go or one-month SIM. A week of real use at home tells you more than any score, and it costs very little.

If your broadband is up for renewal too, sort that at the same time: our guide to comparing by postcode shows how, and good broadband makes Wi-Fi calling work whichever network you pick.

What if I rely on a landline and have no mobile signal?

Direct answer: Tell your landline provider now. The old analogue phone network is due to close by 31 January 2027, and digital landlines need power. If you depend on your landline, Ofcom says your provider must offer a back-up for power cuts, free of charge.

Openreach says BT will retire the old network by 31 January 2027. Digital landlines plug into your router, so they stop in a power cut unless there's a battery back-up. Ofcom's guidance on the future of landline calls says the back-up solution should be free for people who depend on their landline, including people with no mobile signal at home.

Ofcom also says that if your own network has no signal, calling 999 will connect through another network if one is available, shown as emergency calls only or SOS on your phone. In a bottom-10 area, that may still not reach every room, which is why the landline back-up matters.

Our guides to digital landlines in a power cut, priority services registers and care alarms and the switch-off cover what to ask for. Our landline switch-off checker walks you through it.

What should I do now?

Today

Turn on Wi-Fi calling in your phone's settings, and look up your postcode on Ofcom's Map Your Mobile to see which network does best where you live.

This week

Run a speed test where you make calls, check what broadband reaches your address, and try a cheap pay as you go SIM on the network that looks strongest.

When you're ready

Switch network with a free PAC text if another one works better, upgrade your broadband if it can't carry your calls, and tell your landline provider if you depend on your landline.

Better broadband makes poor signal matter less

Wi-Fi calling, video calls and streaming all ride on your broadband. See every option at your postcode, with the full contract cost.

  • ✓Every provider at your postcode, side by side
  • ✓Full fibre, wireless and satellite options in one place
  • ✓We're independent and free to use
Compare deals now →Run a speed test

Prefer to talk it through? Call us on 0330 122 1223

In summary

  • Ofcom's Mobile Matters 2026 found phones got a good connection 81% of the time across the UK, against a proposed target of 90%.
  • West Devon came last on 68% and Watford top on 88%; the bottom 10 are largely rural, and seven are in South West England.
  • EE scored 85%, Three 82%, Vodafone 81% and O2 77%, but the best network varies by nation and by street.
  • Wi-Fi calling is the quickest fix at home, and every network and SIM brand we checked offers it.
  • If you rely on a landline and have no signal, ask your provider about a power-cut back-up before 31 January 2027.

Alex's closing thought

Living with poor signal is frustrating, and for some people it's a real worry, especially if you live alone or care for someone. The good news is that most of the fix is in your hands: Wi-Fi calling costs nothing extra on most networks, and a decent broadband line makes it work. If you're in one of the areas at the bottom of Ofcom's list, or you just can't get a call out at home, ring us. We'll look at what broadband reaches your address and help you choose the setup that keeps you connected.

Keep going: more on signal, coverage and staying connected

Know someone who can't get a signal at home?

Send them this. It shows how their area ranks and the fixes that work, from Wi-Fi calling to a legal booster.

Cite this page

You're welcome to quote or link to this guide. Please credit BroadbandSwitch.uk and link to this page.

In a sentence: In Ofcom's Mobile Matters 2026, published on 16 October 2026, phones across the UK got a good mobile connection 81% of the time, ranging from 68% in West Devon to 88% in Watford, with no area or network reaching Ofcom's proposed 90% target.

Martin-Smith, A. J. (2026, November 5). Worst UK areas for mobile signal: is yours on Ofcom's list? BroadbandSwitch.uk. https://broadbandswitch.uk/insights/ofcom-mobile-matters-2026-worst-areas-mobile-signal/

Frequently asked questions

Where is the worst mobile signal in the UK?

In Ofcom's 2026 figures, West Devon, where phones got a good connection 68% of the time. North Devon was next on 69%, then Cotswold, Malvern Hills and Somerset on 70%.

Where is the best mobile signal in the UK?

Watford came top on 88%, with six London boroughs also on 88%: Sutton, Islington, Waltham Forest, Southwark, Lambeth, and Barking and Dagenham.

Which mobile network is best in the UK?

EE had the highest UK score at 85%, then Three on 82%, Vodafone on 81% and O2 on 77%. Vodafone came top in Northern Ireland, so the best network depends on where you live.

How did Ofcom measure mobile performance?

Using Opensignal's crowdsourced data from apps on Android phones and iPhones, collected from August 2025 to July 2026. A connection counts as good if it works and gets at least 5Mbps down, 1.5Mbps up and no more than 50 milliseconds' delay.

Does Ofcom's score show signal on my street?

No. The league table covers whole council areas. For your postcode, use Ofcom's Map Your Mobile, which shows the same performance score for each network in your area.

Why is my signal bad indoors when the map says I'm covered?

Coverage maps predict where a signal should reach, often outdoors. Thick walls, hills and busy masts can still leave you with little or nothing inside.

Does Wi-Fi calling cost extra?

Usually not. EE says calls cost the same, O2 includes it on pay monthly at no extra cost, and giffgaff says there are no extra data charges. Calls still come out of your normal allowance.

Does Wi-Fi calling work in a power cut?

No. Wi-Fi calling needs your router, and your router needs power. If you rely on your phone in an emergency, keep a charged mobile handy and ask your landline provider about a battery back-up.

Can I use Wi-Fi calling abroad?

Often not. O2 and giffgaff say their Wi-Fi calling only works in the UK, so check your own network before you travel.

Are signal boosters from online shops legal?

Only if they meet Ofcom's technical requirements for licence-exempt repeaters. Ofcom calls boosters that don't meet them illegal devices that risk causing interference.

Will 5G fix poor signal in the countryside?

Ofcom found 5G met its bar 92% of the time against 78% for 4G, and the 2023 Wireless Infrastructure Strategy set an ambition for standalone 5G in all populated areas by 2030. That is an ambition, not a promise, so for poor signal at home today, Wi-Fi calling is the quicker fix.

Can I call 999 with no signal on my network?

Ofcom says calling 999 will automatically connect through another network if one is available. Your phone may show emergency calls only or SOS.

References

Written by Dr Alex J. Martin-Smith, Founder of BroadbandSwitch.uk (LinkedIn). Reviewed by Adrian James, Broadband Editor at BroadbandSwitch.uk (LinkedIn). Published 5 November 2026. Ruth is an example built from the calls we take, not a real customer. Ofcom's figures were read from its own tables as published on 16 October 2026. We'll update this page when Ofcom publishes its next Mobile Matters report or decides on its 90% benchmark. BroadbandSwitch.uk is an independent comparison site and is not a broadband provider. This is general information, not legal or financial advice. Corrections are logged publicly.

Every article on your rights · The latest UK broadband news

Compare deals by postcodeBack to insights hub