What’s the best mobile network in the UK right now?
The best mobile network in the UK for 2026 isn’t one of the big four. According to Which?’s latest customer survey, Talkmobile came out on top with a customer score of 83%, with Tesco Mobile close behind on 81%. Both are budget brands riding on the same masts as the networks people spend the most time complaining about.
That’s the twist most people miss when they’re hunting for the best mobile network. It’s rarely the one with its name on a stadium or a shop on every high street. More often it’s the smaller brand running on someone else’s masts, charging less, and somehow keeping its customers happier while it does it.
If you signed your current contract a few years ago and haven’t looked since, it’s worth five minutes to check whether your provider is still anywhere near the best mobile network for what you actually use your phone for.
The customer score behind these rankings comes from a survey of 5,137 UK adults carried out in January 2026, rating their own provider on network reliability, value for money, customer service, download speeds and how easy it is to get through when something breaks. Two caveats worth holding onto: it’s opinion rather than a lab test, and with a total sample that size, the number of responses behind any individual smaller brand will be much lower than for the big networks. Treat the top of the table as a strong signal rather than a precise ranking.
Which network scored worst for customer satisfaction?
Three UK finished last with a customer score of 65%, just behind O2 on 67% and Lyca Mobile on 68%.
None of the big networks are terrible on paper. Millions of people use them every day without a hitch. But when Which? asked over 5,000 customers in January 2026 about reliability, value and getting help when something breaks, the smaller SIM-only brands won out, and by more than you’d guess.
This is where the Do-Nothing Default does its quiet work. Nobody actively chooses to stay on a network that scores below average. They just never got round to checking, and the network was never going to send a text reminding them to leave.
The full 2026 customer score table
Here’s how the major UK networks compared, checked September 2026. Figures are Which?’s published customer scores from its January 2026 survey.
| Network | Customer score |
|---|---|
| Talkmobile | 83% |
| Tesco Mobile | 81% |
| Smarty | 79% |
| Giffgaff | 79% |
| Voxi | 79% |
| 1p Mobile | 78% |
| Lebara | 78% |
| ASDA Mobile | 77% |
| EE | 74% |
| iD Mobile | 73% |
| Sky Mobile | 73% |
| Vodafone | 72% |
| Lyca Mobile | 68% |
| O2 | 67% |
| Three | 65% |
Here’s the bit that trips people up: most of the top-scoring brands run on the same masts as EE, Vodafone, O2 and Three. Same signal, different bill, different phone call when it goes wrong. That’s really what you’re picking when you choose the best mobile network for customer satisfaction.
Why budget networks are beating the big four
The pattern repeats most years. Budget SIM-only brands tend to score well on value for money and customer service, while the networks that spend on shirt sponsorships and flagship stores tend to score lower on the same measures.
One theory is simple enough. Smaller brands with shorter, plainer contracts have fewer customers stuck on expensive legacy deals they’ve forgotten about. Big networks carry more long-term customers who signed up years ago and never checked whether the best mobile network for their needs had quietly changed since.
None of this means the big four are a bad choice for everyone. If you need a big physical store network, business support or a specific coverage patch, that can matter more than a survey score. But if price and day-to-day service are what you care about, the data points fairly clearly away from the household names when you’re weighing up the best mobile network for you.
Key takeaways
- Talkmobile and Tesco Mobile topped Which?’s 2026 customer survey for the best mobile network overall.
- Three, O2 and Lyca Mobile scored lowest for customer satisfaction.
- Most budget brands run on the same masts as the big four, so coverage is usually similar.
- Switching mobile network now takes about one working day using a PAC or STAC code.
Should you switch, and how much could it save you?
Not everyone needs to move. If you’re already on a network you’re happy with and you’re not overpaying, there’s no prize for switching just because a survey says so. Check your current deal first, our guide to cheap mobile networks running on the same masts is a good place to compare what a similar plan should actually cost.
If your bill has crept up or your provider is sitting near the bottom of the customer score table, it’s worth a look. Our step-by-step guide on how to switch mobile network and keep your number covers the PAC and STAC process in full. It’s also worth checking how networks compare on formal Ofcom complaints, which is a slightly different measure from Which?’s customer score but tends to tell a similar story.
On the savings side, whether it’s worth chasing the best mobile network on paper depends entirely on your current deal, so treat any figure here as a rough guide rather than a promise. Launching its Consumer Hub in September 2026, Ofcom said out-of-contract customers who take broadband, landline and pay-TV from the same provider could save over £100 a year by switching.
Ofcom also says nearly 3.5 million people have used the One Touch Switch process to move landline or broadband provider in the two years since it launched, which suggests the hassle factor that used to put people off is smaller than it once was.
If you’re out of contract and sitting with a network in the bottom half of the table, that’s the cost of doing nothing, roughly speaking. A worse day-to-day experience, for a fee you’re no longer obliged to pay.
Frequently asked questions about the best mobile network
- What is the best mobile network in the UK for 2026?
- Talkmobile is the best mobile network by Which?’s 2026 customer score, at 83%, followed by Tesco Mobile on 81%. Both are budget brands rather than the traditional big four networks.
- Do budget networks use the same coverage as EE, O2, Vodafone and Three?
- Mostly, yes. Brands like Giffgaff, Smarty and Voxi run on the infrastructure of one of the four main networks, so your actual signal is usually similar even though the customer experience can differ.
- How do I switch mobile network and keep my number?
- Text PAC to 65075 from your current phone to get a free porting code, then hand it to your new network when you sign up. The switch typically completes within one working day.
- Will switching mobile network cost me anything?
- If you’re out of contract, switching is usually free. If you’re mid-contract, your existing provider may charge an early exit fee, so it’s worth checking your notice terms before you commit.
- Is Three really the worst mobile network?
- In Which?’s January 2026 survey, Three scored lowest of the networks assessed at 65%. That’s one survey of customer opinion, not a verdict on every individual user’s experience, and coverage in your own area matters more than a national score.
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