Choosing between a SIM-only and a handset contract for your business mobiles comes down to one question: do your employees already have phones? If yes, SIM-only saves £15–£25 per line per month. If no, handset contracts spread the device cost over 12–36 months without a large upfront bill.
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This guide breaks down the real costs of both options, compares them across the four major UK business providers, and helps you calculate which approach saves your business more money over the contract term. All pricing verified as of February 2026.
- SIM-only plans save £15–£25/month per line vs handset contracts - across a 10-person team, that’s £1,800–£3,000/year back in the business
- Choose SIM-only if your existing handsets are under 3 years old - modern smartphones last 4–5 years with battery replacements costing £50–£80
- Handset contracts make sense when upgrading 5+ devices simultaneously - bulk deals from EE and Vodafone can offset the monthly premium
- VAT-registered businesses reclaim 20% on all mobile costs - making the effective saving even larger on SIM-only plans
- 12-month SIM-only terms offer the most flexibility - avoid 24-month contracts unless the per-month saving justifies the lock-in
SIM-Only vs Handset: The Quick Maths
SIM-only plans cost £10–£20/month per line vs £30–£50+/month for handset contracts. A 10-person team saves £2,400–£3,600/year by choosing SIM-only.
| Factor | SIM-Only | Handset Contract |
|---|---|---|
| Monthly cost | £10–£20/line | £30–£50+/line |
| Upfront cost | None (use existing devices) | £0–£100 (device deposit) |
| Contract length | 30 days–24 months | 12–36 months |
| Total 24-month cost (per line) | £240–£480 | £720–£1,200+ |
| Flexibility | High (short rolling contracts available) | Low (locked into device payments) |
| Latest devices | Buy separately (your choice) | Included in monthly cost |
| VAT recovery | On airtime only | On full amount (airtime + device) |
| Best for | Businesses with existing devices | Teams needing new phones |
When SIM-Only Makes Sense
SIM-only is the better choice when your team already has devices, you want short-term flexibility, or you prefer to buy phones outright for better total cost control.
- Your team has working phones: If employees already own suitable devices (or your company provides them), adding a SIM is all you need. You get the same network, data, and features as handset plans.
- You want flexibility: O2 Business offers 30-day rolling SIM-only contracts, meaning you can change or cancel without penalty. This suits startups, seasonal businesses, or companies with fluctuating team sizes.
- You want to control device purchases: Buying phones separately (outright or through a separate finance agreement) often costs less than the device subsidy built into handset contracts. You also get to choose exactly which devices to buy.
- Budget is tight: At £10–£12/month, EE’s SIM-only plans deliver the UK’s best 5G network at a fraction of the handset plan price.
When Handset Contracts Make Sense
Handset contracts suit businesses that need to equip a team with new devices without large upfront spend, or companies that want uniform devices for security and management.
- You need new devices: Handset contracts spread the device cost over the contract term. EE’s plans start from £36/month including flagship iPhones and Samsungs, with no or low upfront payment.
- Cash flow matters more than total cost: Paying £36/month is easier on cash flow than spending £800+ per device upfront, even though the total cost is higher over 24 months.
- Device standardisation: Companies that need all employees on the same device (for security policies, MDM, or app compatibility) benefit from bundled contracts that provide identical phones across the team.
- VAT recovery: Business handset contracts allow VAT recovery on the full amount (airtime + device), which can reduce effective cost by 20% for VAT-registered businesses.
Handset contracts cost more in total but solve the cash flow problem of equipping a team with new devices. Calculate total 24-month cost (including annual increases) before committing.
Provider SIM-Only Pricing Compared
EE offers the cheapest SIM-only from £10/month with the best network, Three offers unlimited data from £20/month, and O2 offers the most flexible 30-day rolling contracts from £13/month.
| Provider | SIM-Only From | Contract Options | Key Feature |
|---|---|---|---|
| EE Business | £10–£12/mo | 12–24 months | Stay Connected Data + Microsoft 365 |
| O2 Business | From £13/mo | 30 days–36 months | Flex Plan auto-adjusts data |
| Vodafone Business | £15–£20/mo | 12–24 months | 83-country roaming on top plans |
| Three Business | From £20/mo | 12–24 months | Unlimited data (600GB fair use) |
For full reviews of each provider, see our best business mobile deals guide.
How to Calculate Your Total Cost
Calculate total cost by multiplying monthly cost by contract months, adding annual price increases, then comparing against SIM-only plus separate device purchase for the true saving.
Do not compare monthly prices alone. Here is a simple formula:
- Handset contract total = (monthly cost × contract months) + annual price increases
- SIM-only total = (SIM monthly cost × contract months) + device cost (if buying new) + annual price increases
- Compare: If SIM-only + separate device is less than handset contract, go SIM-only
Example: EE handset plan at £36/month for 24 months = £864 + ~£48 in price increases = £912. EE SIM-only at £12/month for 24 months = £288 + £24 in increases + £400 phone purchased outright = £712. SIM-only saves £200 over 24 months per line.
Always calculate total cost of ownership over the full contract term including annual price increases. SIM-only with a separately purchased device typically saves £100–£300 per line over 24 months.
For sole traders and freelancers, see our sole trader business mobile contracts guide. For a full provider comparison, see our best business mobile deals guide.
Last updated: February 2026. Prices verified against provider websites. ExpertSure is reader-supported — we may earn a commission through partner links at no extra cost to you.
