How Much Does a Business Mobile Plan Cost in the UK?

What does a business mobile plan actually cost in the UK?

Business mobile SIM-only plans cost £8–£20 per SIM per month from UK networks including O2, EE, Vodafone, and Three. Full device contracts add £15–£30 per month. Where you land in those ranges depends on data allowance, contract length, and how many connections you put on one account.

Here is how the typical per-user, per-month cost breaks down by tariff type:

A practitioner's rule of thumb: most 10–500-staff UK businesses we manage settle around £10–£15 per SIM once the right tariff and volume tier are matched to actual usage. For a fuller breakdown of plan structures, see our guide to business mobile contracts, or the business mobiles hub for the full picture.

SIM-only vs full device contract — which is cheaper?

SIM-only is almost always cheaper over the term because you are not financing a handset inside the monthly fee. A £12 SIM-only plan over 24 months costs £288; the same plan bundled with a £700 phone costs roughly £700 more across the contract. The trade-off is the upfront handset spend.

If your handsets are under three years old and still supported, SIM-only business mobile plans are the lower-cost route. Reserve device contracts for staff who genuinely need new hardware.

How do volume discounts and data pooling cut the bill?

Volume pricing is where businesses save most. Discounts apply from around 10 SIMs upward, with meaningful discounts at 25 and 50+ connections. Pair that with shared data pooling and you stop paying overage charges on individual SIMs that exceed their allowance.

• Volume tiers: networks step the per-SIM price down as connection count rises — 10, 25 and 50+ are the common break points.
• Data pooling: all SIMs draw from one shared allowance, so light users subsidise heavy users and you avoid per-line overage fees.
• Single bill: one account across the estate cuts admin time and surfaces unused SIMs you can cull.

Aggregating connections through a single managed contract, rather than scattering them across consumer accounts, is the simplest way to bring the blended per-user cost down toward the bottom of the £8–£20 range.

Does 5G change what you should pay?

5G rarely adds a large premium on modern tariffs — most standard and unlimited SIM-only plans now include it by default. What matters is coverage and device support. 5G outdoor coverage is available from at least one operator at 97% of UK premises (Ofcom, 2025), and 5G now accounts for 28% of UK mobile connections (2025 UK data), so for most teams it is becoming the baseline rather than an upsell.

Check real-world coverage for your sites on the regulator's data before committing — Ofcom publishes operator-by-operator coverage in its Connected Nations reporting. If field staff rely on data in fringe areas, prioritise the network with the strongest local 5G rather than the cheapest headline price. Our 5G business mobile page covers device and coverage selection in detail.

How does the PSTN switch-off affect mobile strategy?

The UK PSTN switch-off is scheduled for completion by January 2027 (Openreach), which is pushing more businesses to consolidate voice onto mobile and internet-based calling. As traditional analogue lines retire, mobile becomes a primary voice channel for many sites, so it is worth budgeting mobile and voice together rather than in isolation.

If you are reviewing mobile spend now, do it alongside your voice plan — the two decisions interact. See our PSTN switch-off briefing for the timeline and migration options. Ofcom's guidance on the migration of landlines to digital sets out what changes for businesses.

What does it cost to secure and manage those mobiles?

Budgeting only for airtime understates the real cost. Every business phone touches company email, files and Microsoft 365, so management and security are part of the total. The good news: securing a fleet is inexpensive relative to the risk it removes, and it is where AMVIA's security-first model earns its place.

• Mobile device management typically adds a few pounds per device per month and lets you enforce passcodes, encryption and remote wipe — see mobile device management.
• Microsoft Intune is included in many Microsoft 365 Business Premium licences (£16.90/user/mo ex VAT, microsoft.com/en-gb), so the control plane may already be paid for — see Microsoft Intune for mobile.
• Lost-device risk: the NCSC's device security guidance explains why unmanaged phones are a soft target.

Microsoft Intune is documented at learn.microsoft.com for teams that want the technical detail. The point stands: the cheapest plan is not the cheapest outcome if a single lost, unmanaged handset exposes your data.