Four became three, and most people never noticed
For years the UK had four mobile networks: EE, O2, Vodafone and Three. That is no longer true, and the change happened quietly enough that many people are still choosing between brands that no longer operate independently.
Virgin Mobile disappeared first. Virgin Media and O2 merged in 2021, the Virgin Mobile brand was wound down, and all remaining customers were migrated to O2 by late 2023. If you were with Virgin Mobile, you have been an O2 customer for some time whether or not you consciously chose that.
Three and Vodafone merged in 2025, in a deal worth £16.5 billion, creating VodafoneThree. The combined network has around 27 million customers, making it the largest in the UK by subscriber numbers, ahead of both EE and O2.
So the UK now has three physical networks: EE, Virgin Media O2, and VodafoneThree. Everything else advertised is an MVNO riding on one of them.
Why the merger was allowed
This is the part worth understanding, because it explains what happens next.
The Competition and Markets Authority approved the Vodafone-Three merger in December 2024, and it was the first time the CMA had ever permitted a deal reducing the number of UK mobile network operators from four to three.
The reasoning was not that competition did not matter. It was that the two smallest networks were, in the CMA's own assessment, earning returns below their cost of capital, which is a polite way of saying neither was making enough money to fund the infrastructure investment 5G requires.
Modern 5G networks need considerably more capital than previous generations. The argument accepted by the CMA was that Vodafone and Three, combining their mast sites and spectrum holdings, would have both the ability and the incentive to invest at a level neither could manage alone.
Whether that turns out to be true is the open question, and it is precisely why the approval came with conditions attached rather than being waved through unconditionally.
The conditions that protect you
Three commitments were made legally binding as a condition of approval, and they are the things standing between the merger and higher prices.
£11 billion of network investment. Committed over roughly the next decade, with specific focus on 5G standalone rollout and rural coverage. Ofcom monitors progress against this annually rather than taking it on trust.
Tariff protections for three years. VodafoneThree must retain certain existing mobile tariffs and data plans, protecting customers from sharp increases immediately after the merger.
Wholesale terms for MVNOs, also for three years. Pre-agreed prices and contract terms so smaller virtual operators can continue accessing the network competitively.
That third condition matters more than it sounds, and it is worth explaining why.
Why the MVNO protection matters to you
MVNOs are how most people get a genuinely cheap mobile plan. They rent capacity from the big networks and resell it, usually at meaningfully lower prices than the network's own tariffs.
If a merged network could charge MVNOs whatever it liked, the cheap end of the market would quietly disappear. Not through visible price rises on deals you can see, but through smaller providers becoming unable to offer them at all.
The CMA identified this specifically and required pre-agreed wholesale terms as a result. That protection is a large part of why competitive SIM-only pricing still exists on the VodafoneThree network today.
The important caveat: it runs for three years. What happens afterwards depends on whether network investment has delivered enough competitive pressure by then to make the protection unnecessary.
Our SIM-only comparison shows which underlying network each provider actually uses, which is considerably more useful than the brand name when working out what you are really buying.
What has actually changed so far
The practical effects have been gradual rather than dramatic, which is normal for network mergers.
Existing contracts continue under their agreed terms until natural renewal. A merger does not void what you signed.
New plans are sold under the VodafoneThree name, combining Three's simpler unlimited-data positioning with Vodafone's international roaming and entertainment perks.
The Three brand is being phased out, a process expected to take around two years from late 2025.
Roaming has been rebranded, with Three's Go Roam becoming Global Roaming across a wider set of destinations.
The genuinely disruptive part has not happened yet. The combined company still has to decommission overlapping masts where both networks previously covered the same area, and roll out shared 5G standalone infrastructure. That work is where coverage actually changes, for better in most places and occasionally for worse in specific ones.
The Virgin Mobile migration is a useful warning
We have seen how this goes, because it already happened once.
The Virgin Mobile to O2 migration was not smooth. Customers were moved with limited notice, some found out only when their plan changed, and features that had worked previously took time to function correctly on the new network. Virgin had already shifted its customers between underlying networks more than once before the final migration, largely without announcement.
That is not a prediction that VodafoneThree will handle its integration badly. It is a reason to pay attention at renewal rather than assuming continuity, and to check the plan you are on still does what you need.
Does fewer networks mean higher prices?
Honestly, nobody knows yet, and anyone claiming certainty is guessing.
The case for is that two under-invested networks becoming one properly funded network produces better infrastructure, and better infrastructure is what people actually want. The £11 billion commitment is legally binding rather than aspirational, and Ofcom checks progress annually.
The case against is straightforward competition economics: three competitors generally produce keener pricing than four. The tariff and wholesale protections acknowledge this risk directly. They exist precisely because the CMA thought prices might otherwise rise.
The honest answer is that protections cover the next three years, and beyond that it depends on whether the investment delivers. That is a genuine uncertainty rather than a rhetorical one.
What this means for choosing a network now
Check which physical network your provider actually uses. With three networks and dozens of MVNOs, the brand on your bill tells you very little about the coverage you get. An MVNO gives you the same masts as its host network, usually cheaper, with the trade-off that MVNO traffic can be deprioritised when the network is congested.
Coverage still varies by postcode more than by network. National coverage figures between the three are close enough that local variation matters more than headline percentages. Check your actual home and workplace before choosing on price alone.
Watch renewal dates. Legacy plans inherited from merged brands are exactly the kind that quietly become uncompetitive. If your plan originated with Virgin Mobile or pre-merger Three, compare it against current pricing.
Do not panic-switch. Existing contracts are protected and the tariff commitments run for three years. The mergers themselves create no urgency.
Compare current options in our SIM-only comparison, or see how the networks stack up on coverage and speed.
Switching, if you decide to
Straightforward, and you keep your number.
Text PAC to 65075 from your current phone. You will receive a Porting Authorisation Code. Give it to your new provider and the transfer completes within one working day.
You do not need to contact your existing provider first, and they cannot refuse the request. Check whether you are still within a minimum term, since early termination charges can apply.
The short version
The UK has three mobile networks now, not four. Virgin Mobile was absorbed into O2 in 2023. Three merged with Vodafone in 2025 to create the country's largest network by customer numbers.
For the next three years, regulatory conditions protect tariffs and keep wholesale access open for cheaper MVNOs. Beyond that, whether consolidation was good for consumers depends entirely on whether £11 billion of committed investment produces a network worth having.
In the meantime the practical advice is unchanged: check coverage where you actually are, look at MVNOs before paying network prices, and review your plan at renewal rather than letting it roll.
Related reading: EE vs O2 vs Vodafone vs Three: which offers the best coverage? · Best network coverage UK 2026 · Can I use Virgin Mobile abroad without roaming charges? · Can I use Three abroad without roaming charges?
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