What the CMA Actually Required When It Approved the Vodafone Three Merger
When the Competition and Markets Authority signed off the Vodafone and Three merger, it didn’t just wave it through. The approval came with legally binding commitments the combined business has to keep, not just a wish list of good intentions. Automatic network roaming is one of the most tangible for ordinary customers, alongside the pricing protections we covered in our guide to what the merger means for your bill.
Alongside it sits a pledge to invest £11 billion in the network over eight years, price caps that protect certain existing tariffs for at least three years, and rules requiring fair wholesale terms for the smaller networks that piggyback on Vodafone and Three’s infrastructure. The CMA’s own case page for the merger sets out the full list of commitments the companies are legally bound to.
What Is Automatic Network Roaming, and Does It Cost Anything?
It means your phone can connect to whichever of the two networks, Vodafone or Three, has the stronger signal in your exact location, switching automatically without you touching a setting. No extra charge applies, and there’s nothing to opt into or set up.
The technology behind it is called Multi Operator Core Network sharing, MOCN for short, which lets a single mast serve customers from both networks. It’s a genuine regulatory requirement, not a marketing extra either company could quietly drop later.
That distinction matters more than it might seem. A feature a company offers voluntarily can be withdrawn or changed whenever it suits them. Automatic network roaming exists because the CMA made it a condition of letting the merger go ahead, which puts it on a very different footing.
Are You Covered? Which Customers Get It
Customers on Vodafone, Three, VOXI, Talkmobile and SMARTY are covered by automatic network roaming as MOCN rolls out across the combined network. More than 8,000 masts had been upgraded by the time of writing, giving somewhere in the region of 21 million customers access to automatic roaming, with the wider rollout continuing over the following years.
Coverage depends on whether the specific mast near you has been upgraded yet, so two people on the same network in different towns can have a genuinely different experience for a while longer. If you’re unsure, our mobile coverage checker guide explains how to check what’s actually available where you live.
The rollout is scheduled to keep expanding over several years rather than arriving everywhere at once, so if automatic network roaming isn’t live in your area yet, that’s expected rather than a sign anything has gone wrong.
What the CMA’s deal guarantees
- Automatic roaming between Vodafone and Three’s networks, at no extra cost.
- An £11 billion network investment commitment over eight years.
- Price caps protecting certain existing tariffs for at least three years.
- Fair, non discriminatory wholesale terms for smaller networks that rent capacity from Vodafone or Three.
What Else Does the CMA’s Deal Protect?
The price cap commitment matters more than it might first sound. Rather than leaving the newly combined business free to raise prices once competition narrowed from four major networks to three, the CMA locked in protection on specific existing tariffs for a fixed period. That’s a rights guarantee, not a supplier promise that could quietly change.
The wholesale terms matter for anyone on a smaller network too. Providers that buy capacity from Vodafone or Three to resell under their own name are entitled to non discriminatory pricing under the deal, which is part of what keeps competition alive on the SIM only end of the market even after a merger of this size.
How Do You Know If It’s Working for You?
The clearest sign is fewer dead zones in places that used to be patchy on your specific network, since your phone is now drawing on two networks’ masts instead of one. If you’re still getting poor signal in a spot that should now be covered, that’s worth raising with your provider directly, since the commitment is meant to be delivered, not just promised.
Worth remembering too: automatic network roaming only helps where at least one of the two networks has decent coverage. If both Vodafone and Three genuinely struggle in your specific area, combining them doesn’t create signal that wasn’t there to begin with. It’s a genuine improvement for most people, not a fix for every rural blackspot overnight.
If a genuine complaint about coverage or service goes nowhere with your provider, Ofcom’s standard mobile complaints process still applies here exactly as it would for any other mobile issue.
Frequently asked questions about automatic network roaming
- Do I need to change any settings to get automatic network roaming?
- No. Automatic network roaming works by itself once the masts covering your area have been upgraded, with nothing to switch on in your phone’s settings.
- Will I be charged extra for roaming onto the other network?
- No, it’s included at no extra cost as part of the CMA’s approval conditions for the merger, not an optional paid add on.
- I’m on a smaller SIM only network, does this affect me?
- The roaming feature itself is specific to Vodafone and Three, but if your network rents capacity from either of them, the CMA’s non discriminatory wholesale pricing rules apply and help keep their pricing competitive.
- How long do the CMA’s price caps last?
- The commitment protects certain existing tariffs for a minimum of three years from the merger’s approval, not indefinitely.
- What if automatic network roaming isn’t working where I live?
- Coverage depends on whether your local masts have been upgraded yet. If it’s been a while and signal is still poor, raise it directly with your provider.
