Which mobile network is best for business in Scotland?

How the networks compare in 2026

RootMetrics tested the four UK networks across 16 major metropolitan areas between January and June 2026:

All four networks improved on their scores from a year earlier. But RootMetrics itself notes that the results are dominated by urban testing and give little weight to rural performance. For a business with sites, field teams or customers outside Glasgow and Edinburgh, city results only tell part of the story.

One more change to keep in mind: Vodafone and Three merged in June 2025 as VodafoneThree and are combining their networks, so their coverage will look different over the next few years. And all four networks have now switched off 3G, which matters if you have older handsets, alarms or telemetry devices that relied on it.

Why coverage matters more in Scotland

Scotland's geography makes mobile coverage patchier than anywhere else in the UK. According to Ofcom's Connected Nations report for Scotland (data from July 2025):

The gap between "each operator" and "all four" is the whole story. Each network covers roughly four-fifths of the country, but not the same four-fifths. One network can be excellent at your Glasgow office and poor at a site in Argyll, while another is the reverse. Ofcom also reports that Scotland has the lowest 4G geographic coverage of any UK nation.

It's getting better. Under the Shared Rural Network programme, the operators met their 2024 target of good geographic coverage across 88% of the UK, and they're building new masts in "total not-spots", areas with no coverage from anyone, through to 2027 (Ofcom, 2025).

What should you expect region by region?

We don't publish a league table by region, because coverage changes mast by mast and a regional average would mislead you. What we can tell you is how the problem changes as you move across Scotland, and what to do about it.

Glasgow, Edinburgh and the Central Belt. Outdoor coverage is strong on all the networks, and the differences are mostly about speed and capacity. The real problems here are indoors: basements, steel-framed warehouses, modern offices with coated glass and stadiums on a busy day. Choose on indoor performance at your own buildings, and plan for WiFi calling.

Fife, Tayside, Aberdeen and the North East. Towns are well covered, but coverage thins quickly in the glens and on the coast, and farms, quarries and energy sites often sit exactly there. Check each regular site individually.

Dumfries and Galloway and the Borders. Long rural roads and small settlements mean dropped calls between sites are common. Staff who drive for a living should be on whichever network holds up best on their routes, and hands-free calls need a signal that lasts the journey.

Argyll, the Highlands and Islands. This is where the "each operator" figure matters most. Glens, sea lochs and islands can leave one network strong and the others absent. For remote sites, plan on a 4G or 5G router with an external antenna, or satellite, rather than relying on handsets alone.

On the roads, Ofcom's data shows a similar pattern: 98% of Scotland's motorways and A roads have in-vehicle 4G from at least one operator, but only 68% from all four (Ofcom, July 2025 data).

How do you fix weak coverage indoors?

First, WiFi calling. Most modern handsets can make and receive normal mobile calls and texts over WiFi when the mobile signal is weak, using the same number, with no app. EE, O2 and Vodafone all support it on compatible handsets. If your building has good WiFi, this solves most indoor problems cheaply. It needs the feature switched on and, ideally, business WiFi that prioritises voice traffic. WiFi calling works on the plan.com tariffs and handsets Indigo supplies, and we'll switch it on for you.

Second, check the building itself. Moving desks away from a basement or a steel wall sometimes does more than switching network.

Third, for large buildings or venues, there are approved indoor mobile repeaters and small-cell systems (small indoor mobile masts). Ofcom only permits repeaters that meet its technical rules; cheap online boosters can interfere with the network and are illegal to use. Treat this as a project, not a gadget.

Can you use more than one network?

Yes, and for many Scottish businesses it's the best answer. There are three common ways to do it:

Different networks for different teams. Office staff on the network that's best indoors in Glasgow; field teams on the network that's best across their patch. It can all sit on one account with one bill.

Dual-SIM or eSIM handsets. Most current phones take a physical SIM and an eSIM (a digital SIM built into the phone), so one person can carry two networks. It suits the handful of people who work in very remote places, but it's a second line to pay for and manage.

Multi-network routers for sites. For site cabins, compounds and temporary offices, a 4G or 5G router with an external antenna, sometimes with SIMs from two networks, gives the whole site a connection and lets people use WiFi calling. Our site connectivity guide for construction and renewable energy field teams guide cover this in more detail.

How to choose the right network for your business

1. List where your people work: offices, regular sites, depots, customers' premises and the routes between them.
2. Check each location on the networks' own maps and Ofcom's coverage checker, indoors and outdoors.
3. Ask your team. Staff who already work at a site know which networks drop out.
4. Test before you commit. Borrow a SIM on each shortlisted network and try it where it matters.
5. Look beyond coverage. Spend controls and account management affect your costs more than the network does.

What about costs?

The network you choose has less effect on your bill than how the account is managed. The biggest savings usually come from stopping out-of-bundle charges and keeping every user on the right bundle throughout the contract, not just at renewal. We've written about that in how to cut business mobile costs.

In practice. Because we're not tied to one network, the first thing our mobile team does is ask where your people work. A contractor with sites in Lanarkshire and Argyll may well end up with two networks on one account, and that's a better result than forcing everyone onto the one that wins the national table.

How Indigo does this. Indigo Unified Communications supplies business mobiles on EE, O2 and Vodafone from our Glasgow office, so we recommend the network that works where your people do. Our mobile team checks coverage at your addresses before you commit, sets every line's spend cap to zero and reviews your account throughout the contract, which typically saves about 20% over the contract. For remote sites, 4G and 5G connectivity is usually live within 2–3 working days. Get a free mobile bill review →

What to do next

1. Write down every address and route your team works from, with a rough headcount at each.
2. Run each through Ofcom's coverage checker and the networks' maps, indoors and outdoors.
3. Ask staff at each site which network works and which doesn't.
4. Check that WiFi calling is switched on for anyone with poor indoor signal.
5. Ask us for a free bill review with a coverage check, or check connectivity options for a site.