If your employees already have working phones, putting them on SIM only business plans instead of handset contracts is the single biggest cost-saving decision you can make on your mobile bill. The savings are immediate and substantial — 50–70% less per line compared to handset contracts.
This guide explains why SIM only is the default smart choice for most business teams, when handset contracts make more sense, and how to get the best SIM only deals in 2026.
SIM Only vs Handset Contract: The Numbers
| Factor | SIM Only | Handset Contract |
|---|---|---|
| Monthly cost | £6–16/mo | £18–45/mo |
| After VAT | £5–13.33/mo | £15–37.50/mo |
| Contract length | 30 days / 12mo / 24mo | 24 months |
| Includes phone | No | Yes |
| Best for | Staff with existing phones | Staff needing new phones |
An employee on a £30/month handset contract who switches to £8/month SIM only saves £22/month — £264/year per person. For a team of 10, that’s £2,640/year in immediate savings.
The Best SIM Only Business Plans Right Now
Best Budget: Three 5GB at £6/mo (£5 after VAT)
The cheapest business SIM in the UK. Unlimited calls, texts, 5G. For office workers on WiFi, 5GB is more than enough.
Best All-Rounder: O2 15GB at £9/mo (£7.50 after VAT)
15GB covers most mobile workers comfortably. EU roaming included, good volume discounts for 10+ lines, strong management portal.
Best for Heavy Users: Three Unlimited at £12/mo (£10 after VAT)
Cheapest unlimited data by far. 5G included. Ideal for field workers, tethering, and anyone who can’t rely on WiFi.
Best for Coverage: EE 10GB at £8.40/mo (£7 after VAT)
EE’s 99% 4G coverage means fewer dead spots. Worth the £1–2/mo premium if your team works across varied locations including rural areas.
When to Choose SIM Only
- Staff have working phones: Any phone from the last 3–4 years is perfectly adequate for business use
- Budget is tight: SIM only is 50–70% cheaper per line than handset contracts
- Team changes frequently: Shorter contracts and lower costs make SIM only ideal for businesses with seasonal staff or high turnover
- You want flexibility: 12-month or 30-day rolling terms let you adjust quickly as needs change
- BYOD policy: Staff using their own devices need a SIM, not a phone
When Handset Contracts Make More Sense
- Staff need new phones: Spreading the cost over 24 months is easier on cash flow than buying phones outright
- Client-facing roles: Directors and sales professionals may need current-generation phones for professional image
- Security requirements: Company-owned phones are easier to manage with MDM than employee-owned BYOD devices
- Phone condition is poor: Phones with cracked screens, dying batteries, or outdated software should be replaced
The Hybrid Approach: SIM Only + Handsets
The smartest businesses don’t go all-SIM-only or all-handset. They mix:
- Staff with good phones → SIM only (£6–12/mo)
- Staff needing phones → handset contract (£18–35/mo)
- Temporary or part-time staff → 30-day rolling SIM (£8–14/mo)
All on one business account, one invoice, one point of contact. This hybrid approach delivers the lowest total cost while ensuring everyone has what they need.
Get a free SIM only business quote — 60 seconds, all networks compared
The Hidden Costs of Handset Contracts vs SIM Only Savings
When a network quotes £30 per month for a handset contract, the headline figure obscures several layers of additional cost that do not apply to SIM only plans. Understanding these hidden expenses makes the financial case for SIM only even stronger than the basic price comparison suggests.
First, there is the insurance question. Networks strongly recommend insurance on handset contracts, typically £4 to £6 per month. Over 24 months, that adds £96 to £144 per device. On a SIM only plan where the employee already owns the phone, insurance is optional and often unnecessary because the phone has already depreciated past the point where a claim makes financial sense. Second, annual price rises hit harder on handset contracts because the increase applies to the full monthly amount. A 6 per cent CPI-linked rise on a £30 handset contract adds £1.80 per month; the same percentage on a £10 SIM only plan adds only 60p. Over two years, the compounding effect means handset contract holders pay proportionally more in total overage.
Third, handset contracts include an implicit finance charge for the phone. Comparing the total contract cost to buying the handset outright plus a SIM only plan almost always shows the contract route costs 10 to 20 per cent more. For a flagship phone costing £1,000 outright, a 24-month contract at £38 per month totals £912 — but the equivalent SIM only plan at £10 per month for 24 months is £240, plus £1,000 for the phone, totalling £1,240 versus £912. At first glance, the contract seems cheaper, but factor in the fact that many employees already have a perfectly functional phone and do not need a new one, and the £240 SIM only total wins decisively.
Migrating from Handset Contracts to SIM Only
If your business currently has all employees on handset contracts, switching to SIM only requires a phased approach timed around contract expiry dates. Start by listing every line, its contract end date, and whether the employee’s current handset is still in good working order. Group lines into waves: those expiring in the next three months, those expiring in three to six months, and those with more than six months remaining.
For the first wave, request PAC codes from your current provider and begin getting quotes for SIM only replacements from all four networks. A broker can handle this comparison for you at no cost, since the winning network pays their commission. Deploy the new SIMs as each handset contract expires. There is no need to pay early termination fees — simply let the contract run out and move to the new SIM only deal. Employees keep their existing phones and their existing numbers port across within 24 hours.
For lines with more than six months remaining, note them in your renewal calendar and get quotes 90 days before expiry. This systematic approach means your entire fleet transitions to SIM only over 6 to 12 months without disruption and without paying a penny in exit fees. If individual employees need a new phone, consider buying refurbished handsets outright — a two-year-old flagship costs £300 to £400 and performs identically to a new one for business tasks like email, calls, and MDM-managed apps.
Contract Flexibility: SIM Only vs Handset at a Glance
| Feature | SIM Only | Handset Contract |
|---|---|---|
| Minimum term | 30 days | 24 months |
| Typical term | 12 months | 24 months |
| Early exit cost | £0 – remaining months | Remaining months + device balance |
| Mid-contract upgrade | Change plan anytime | Limited to data changes |
| Network switch ease | Simple at renewal | Tied until device paid off |
| Volume discount | 10–30% on 3+ lines | 5–15% on 5+ lines |
| Annual price rise impact | Low (small base amount) | High (large base amount) |
The flexibility gap matters most when your business is growing or changing. Adding five new starters on SIM only takes a phone call and next-day delivery. Adding five on handset contracts involves credit checks, device procurement, and a two-week lead time. If a team member leaves, ending a 30-day SIM costs nothing; ending a 24-month handset contract 12 months early can cost £200 to £400 in remaining device payments. For fast-moving businesses, SIM only agility often justifies its use even where a small handset subsidy from a contract might seem financially tempting. Check the latest SIM only deal comparisons to see current pricing across all networks.
Building a Case for SIM Only to Present to Management
If you are the IT manager or operations lead trying to convince senior leadership to switch from handset contracts to SIM only, you need a concise business case that speaks in pounds, not jargon. Here is a template you can adapt.
Start with the current annual mobile spend. Pull the figure from your latest accounts — it is usually in overheads or telecommunications. Next, calculate the projected SIM only cost using current market rates. For most businesses, this is 40 to 60 per cent lower. Present the difference as a hard annual saving: “Moving to SIM only will save approximately £X,XXX per year.” Follow with a risk assessment: what is the downside? The main risk is employees needing new phones, but audit data usually shows 70 to 80 per cent of staff have a device less than three years old that works perfectly.
For the remaining 20 to 30 per cent, budget for refurbished handsets purchased outright at £300 to £400 each — a one-off cost that is still lower than the two-year handset contract premium. Include a timeline showing a phased transition as contracts expire, with zero early termination fees. End with a recommendation to get a free multi-network comparison through a broker, which costs nothing and provides hard numbers to support the case. Mention that all business SIM plans include 5G access at no additional charge and that spend caps protect against any overage surprises during the transition.
Frequently Asked Questions
Can I mix SIM only and handset contracts on one account?
Yes — business accounts support any mix of SIM only and handset contracts. All appear on one invoice with centralised management.
What happens when my SIM only contract ends?
It moves to a rolling monthly rate. If you don’t renegotiate, you’ll likely pay 15–30% more than current market rates. Always get fresh quotes before your contract expires.
Is a business SIM different from a consumer SIM?
The SIM card itself is identical. The difference is in the account type: business billing, VAT invoicing, spend controls, dedicated business support, and account management features.
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