Business SIM Only Deals UK 2026: Complete Comparison Guide
Business SIM Only Deals UK 2026: Complete Comparison Guide
If your business is still paying for mobile handset contracts when your team's phones are perfectly functional, you are almost certainly overspending. The shift to SIM only deals is the single most effective way to reduce business mobile costs, and in 2026 the savings are more compelling than ever.
A business SIM only deal strips out the cost of the handset from your monthly payment, leaving you paying only for airtime, calls, texts, and data. The result is typically a significant reduction in monthly cost compared to an equivalent handset contract. For a business with 10 mobile lines, that can translate to substantial savings every year.
Yet many businesses hesitate. They worry about coverage differences (there are none), service quality (identical), or the hassle of switching (minimal). This guide addresses every concern, compares SIM only plans from all four UK networks side by side, and gives you a clear framework for deciding whether SIM only is right for your business.
At Compare The Networks, we are a UK-based comparison service with reviews on Trustpilot. We have been helping UK businesses switch to more cost-effective mobile deals and SIM only recommendations are our bread and butter. If you want a personalised comparison, get a free quote, it takes two minutes.
Why SIM Only Saves 40-60% vs Handset Contracts
The maths behind SIM only savings is straightforward. A handset contract bundles two costs into one monthly payment:
- The airtime cost. your calls, texts, and data allowance
- The device cost. the phone itself, spread over 24 or 36 months
When your contract ends, the device is fully paid off, but your monthly payment stays the same unless you actively switch to a SIM only plan. Many businesses continue paying the bundled rate for months or years after the device cost has been fully amortised. This is, effectively, paying for a phone you already own.
The Real Numbers
Compare the total cost of a mid-range business phone, such as a Samsung Galaxy A55, over 24 months. On a bundled handset contract you pay a higher monthly rate that quietly includes the cost of the phone. On a SIM only plan with the same 25GB allowance, you pay a lower monthly rate and buy the phone outright, so the device cost is transparent rather than hidden.
Across the full 24-month term, SIM only plus an outright phone typically works out cheaper than the equivalent bundled contract, and the gap widens with premium handsets like the latest iPhone. Multiply that per-line saving across a fleet of 20 lines and it adds up to a meaningful reduction over a single contract period. Get a free quote and we will put the exact numbers side by side for your team.
But the real savings come when you keep a phone beyond its original contract term. A well-maintained business phone lasts 3-4 years. Once the device is paid off after 24 months, every subsequent month on a SIM only plan saves the full difference between airtime-only and the old bundled rate.
All 4 Networks: Business SIM Only Plans Compared
Here is a comprehensive comparison of business SIM only plans from EE, Vodafone, O2, and Three. Plans are on 12-month contracts unless otherwise stated.
EE Business SIM Only Plans
| Data | Contract Length | 5G Included | Key Extras |
|---|---|---|---|
| 10GB | 12 months | Yes | WiFi calling, EU roaming (Smart+) |
| 25GB | 12 months | Yes | WiFi calling, EU roaming (Smart+) |
| 50GB | 12 months | Yes | Inclusive roaming (47 destinations) |
| 100GB | 12 months | Yes | Inclusive roaming, priority support |
| Unlimited | 12 months | Yes | Inclusive roaming, all extras |
EE's SIM only plans are positioned at the premium end but justified by the UK's widest 5G coverage and most consistent network performance. Multi-line discounts of 10-20% are available for businesses with 5+ lines. See our full EE business mobile deals page.
Vodafone Business SIM Only Plans
| Data | Contract Length | 5G Included | Key Extras |
|---|---|---|---|
| 10GB | 12 months | Yes | Roaming in 83 destinations (Essentials+) |
| 25GB | 12 months | Yes | Roaming in 83 destinations |
| 50GB | 12 months | Yes | Inclusive roaming, VeryMe rewards |
| 100GB | 12 months | Yes | Inclusive roaming, priority support |
| Unlimited | 12 months | Yes | All inclusive, business extras |
Vodafone offers competitive pricing with the widest inclusive roaming, 83 destinations without a daily charge on Essentials plans and above. The Vodafone-Three merger is also expanding coverage rapidly. See our Vodafone business mobile deals page.
O2 Business SIM Only Plans
| Data | Contract Length | 5G Included | Key Extras |
|---|---|---|---|
| 10GB | 12 months | Yes | Priority rewards, flexible contracts |
| 25GB | 12 months | Yes | Priority rewards, WiFi calling |
| 50GB | 12 months | Yes | Priority extras, Starlink backup |
| 100GB | 12 months | Yes | Business support, all extras |
| Unlimited | 12 months | Yes | Everything included |
O2 sits in the middle of the market on pricing, with particular strengths in contract flexibility and the Priority rewards programme. Their Starlink satellite partnership adds unique value for businesses in areas with poor terrestrial coverage. See our O2 business mobile deals page.
Three Business SIM Only Plans
| Data | Contract Length | 5G Included | Key Extras |
|---|---|---|---|
| 10GB | 12 months | Yes | Go Roam (71 destinations, Advanced plans) |
| 25GB | 12 months | Yes | Go Roam (Advanced plans) |
| 50GB | 12 months | Yes | Go Roam, personal hotspot |
| 100GB | 12 months | Yes | Go Roam, all extras |
| Unlimited | 12 months | Yes | Everything included |
Three is consistently the cheapest option, with unlimited data that often costs less than what some competitors charge for 50GB. The trade-off is slightly weaker geographic coverage, particularly in rural areas. See our Three business mobile deals page.
Side-by-Side Comparison: 25GB SIM Only
| Factor | EE | Vodafone | O2 | Three |
|---|---|---|---|---|
| 5G included | Yes | Yes | Yes | Yes |
| EU roaming included | Smart plans+ | Yes (83 countries) | Daily pass | Advanced plans |
| WiFi calling | Yes | Yes | Yes | Yes |
| Coverage ranking | 1st | 2nd | 3rd | 4th |
Availability varies based on multi-line discounts, promotional offers, and exact plan configuration. Get an exact quote for your business.
Short-Term vs 12-Month Contracts
One of the key advantages of SIM only deals is the flexibility to choose shorter contract terms. Here is how the two main options compare.
Flexible Short-Term Contracts
How it works: You pay monthly with no long-term commitment. You can cancel, change plans, or switch networks on short notice.
Advantages:
- Maximum flexibility, scale up or down as your business needs change
- No early termination fees
- Easy to trial a new network before committing long-term
- Ideal for temporary staff, seasonal workers, or project-based roles
Disadvantages:
- Typically costs a little more per month than a 12-month contract
- Pricing can change at short notice from the network
- May not qualify for the deepest multi-line discounts
12-Month Contracts
How it works: You commit to 12 months at a fixed price. Early cancellation incurs a fee (typically the remaining months' charges).
Advantages:
- Lower monthly cost than a flexible short-term plan
- Price locked for the full 12 months (protected from mid-contract increases on most plans)
- Often qualifies for better multi-line discounts
- Suitable for stable teams with predictable needs
Disadvantages:
- Early termination fees if you need to cancel
- Less flexibility to respond to changing business needs
- Must actively review and renew at the end of the term
Which Should You Choose?
| Scenario | Recommended Contract |
|---|---|
| Stable team, predictable needs | 12-month |
| Growing business, adding lines frequently | Flexible short-term |
| Seasonal or temporary workers | Flexible short-term |
| Trialling a new network | Flexible short-term (then switch to 12-month) |
| Want the lowest possible cost | 12-month |
| Managing contractors or freelancers | Flexible short-term |
For most established businesses with stable teams, 12-month contracts offer the best balance of price and stability. For growing businesses or those with fluctuating headcount, the flexibility of a short-term plan is worth the small monthly premium.
Data Allowances Explained
Choosing the right data allowance is one of the most common sources of overspending on business mobiles. Buy too much and you waste money. Buy too little and you face overage charges.
How Much Data Do Business Users Actually Need?
| User Type | Typical Monthly Usage | Recommended Allowance |
|---|---|---|
| Light user (calls, email, basic browsing) | 2-5GB | 10GB |
| Standard office worker (email, Teams, browsing, CRM) | 5-12GB | 15-25GB |
| Heavy user (video calls, tethering, media) | 15-30GB | 50GB or Unlimited |
| Remote/hybrid worker (main internet via mobile) | 30-100GB+ | Unlimited |
| Fleet driver (navigation, tracking apps) | 3-10GB | 10-15GB |
The Case for Unlimited Data
Unlimited data plans from Three are among the cheapest in the market, often less than the cost of a 50GB plan on some other networks. For businesses where even one or two overage charges per year are likely, unlimited plans can actually be cheaper than capped plans once you factor in the overage cost.
When unlimited makes sense:
- Employees regularly tether their laptop to their phone
- Video conferencing is a daily activity
- Your team works from variable locations with unreliable WiFi
- You want to eliminate the risk of overage charges entirely
- The cost difference between unlimited and your current capped plan is small
For a detailed breakdown of data usage by activity and role, see our business mobile data usage guide.
eSIM Options for Business SIM Only
eSIM (embedded SIM) technology eliminates the need for a physical SIM card. Instead, your plan is downloaded directly to the phone. All four major UK networks now support eSIM for business SIM only plans.
eSIM Advantages for Business
- Instant activation: No waiting for a physical SIM to arrive in the post. Download and activate within minutes.
- Dual SIM capability: Use an eSIM alongside a physical SIM, allowing employees to carry one phone with two numbers (business and personal, or UK and international).
- Remote provisioning: IT administrators can push eSIM profiles to devices remotely via MDM, without needing to physically handle each phone.
- No physical SIM to lose or damage: Eliminates the risk of SIM tray issues, bent SIMs, or lost SIM cards during device swaps.
eSIM Compatibility
| Device | eSIM Support |
|---|---|
| iPhone XR and later | Yes |
| Samsung Galaxy S20 and later | Yes |
| Google Pixel 3 and later | Yes |
| Samsung Galaxy XCover7 | Yes |
| Most rugged phones (CAT, Doogee) | Varies, check model |
eSIM by Network
| Network | eSIM Available (Business) | Activation Method | Multi-Device eSIM |
|---|---|---|---|
| EE | Yes | QR code or app | No |
| Vodafone | Yes | QR code or app | No |
| O2 | Yes | QR code | No |
| Three | Yes | QR code or app | No |
When to Choose SIM Only vs Handset Contract
SIM only is not always the right choice. Here is a clear decision framework.
Choose SIM Only When:
- Your team's current phones are in good condition with at least 12 months of useful life
- You prefer to buy devices outright (cash purchase or business lease)
- You want maximum contract flexibility (short-term options are only available on SIM only)
- Your previous handset contracts have expired but you are still paying the bundled rate
- You want to reduce monthly costs immediately
- You need to scale lines up and down frequently
Choose a Handset Contract When:
- Your team needs new phones and you prefer to spread the cost
- You want a single monthly bill covering both device and airtime
- Your business cannot afford the upfront cost of buying devices outright
- You want the phone to be covered by the network's insurance and support
- You are happy to commit to 24-36 months
The Hybrid Approach
Many businesses use a combination: SIM only for employees with functional devices and handset contracts for those who need new phones. This is perfectly manageable on a single business account with any of the four networks.
Total Cost of Ownership: SIM Only + Phone vs Handset Contract
Across every scenario, buying a phone outright and pairing it with a SIM only plan tends to beat the equivalent bundled handset contract over a 24-month term. The advantage is largest when you keep a phone you already own, and it holds whether you choose a mid-range or a flagship handset, and whether you spread the comparison over 24 or 36 months. Get a free quote and we will work out the exact total cost for your team and phones.
How to Keep Your Number (PAC Code Process)
Switching to a new SIM only deal does not mean losing your business phone numbers. UK regulations guarantee your right to port your numbers to any network, and the process is straightforward.
Step-by-Step Number Porting
- Request a PAC (Porting Authorisation Code) from your current provider. You can do this by texting PAC to 65075, calling your network, or requesting it online. The network must provide it within one working day.
- Give the PAC to your new provider when ordering your SIM only plan. You can do this online, by phone, or through a comparison service like Compare The Networks.
- The switch happens within one working day. Your old SIM will stop working and your new SIM will activate with your existing number. There is typically a brief interruption (minutes, not hours) during the switchover.
- If you want to cancel without porting, request a STAC (Service Termination Authorisation Code) instead of a PAC. This cancels the line without transferring the number.
Important PAC Code Rules
- Your PAC is valid for 30 days from issue.
- Your current provider cannot charge you for providing a PAC.
- You can request a PAC even if you are mid-contract, but early termination fees will still apply.
- Porting multiple business lines simultaneously is standard practice. Your new provider can coordinate the switch so all lines transfer on the same day.
Bulk Number Porting for Businesses
If you are porting 5+ lines, most networks offer a dedicated business porting team that handles the process end-to-end. At Compare The Networks, we manage the porting process for every business we help switch. get a free quote and we will handle it all.
Bringing Your Own Device (BYOD) with SIM Only
SIM only deals are the natural companion to a BYOD (Bring Your Own Device) policy, where employees use their own personal phones for work.
BYOD + SIM Only: How It Works
- The business provides a SIM only plan (company-paid airtime)
- The employee uses their own phone
- Business data is protected through MDM or app containerisation
- The employee carries one device for both personal and business use
BYOD Considerations
| Consideration | Detail |
|---|---|
| Phone compatibility | Ensure employees' phones are unlocked and compatible with your chosen network's frequencies |
| Minimum device standards | Set minimum requirements: OS version, encryption capability, screen lock |
| Security | Install MDM or app management. See our mobile security guide |
| Insurance | Clarify who is responsible for device repairs and replacement |
| Tax implications | HMRC allows tax-free provision of one mobile phone per employee. With BYOD, the employee owns the phone, the SIM plan is the business expense |
| Leaving the company | The employee keeps their phone; the business cancels or ports the SIM |
BYOD vs Company Phone + SIM Only
| Factor | BYOD + SIM Only | Company Phone + SIM Only |
|---|---|---|
| Monthly cost | SIM only cost only | SIM only + device cost |
| Employee satisfaction | Higher (uses preferred phone) | Lower (may carry two phones) |
| Security control | Limited (their device) | Full (your device) |
| GDPR simplicity | Complex (mixed data) | Simpler (company data only) |
| Best for | Cost-conscious SMBs, low-sensitivity roles | Security-focused businesses, regulated industries |
Bulk SIM Only Deals for Teams
Businesses ordering multiple SIM only lines can access pricing that is not available on network websites. The more lines you order, the better the rate.
Bulk Pricing Tiers
| Number of Lines | Typical Discount vs Single-Line Pricing | How to Access |
|---|---|---|
| 2-4 lines | 0-5% | Network website or phone |
| 5-9 lines | 5-10% | Network business team |
| 10-24 lines | 10-15% | Network business team or comparison service |
| 25-49 lines | 15-25% | Comparison service or direct account manager |
| 50-99 lines | 20-30% | Dedicated account manager |
| 100+ lines | 25-40% (negotiable) | Enterprise sales team |
How Compare The Networks Gets Better Bulk Rates
As a UK-based comparison service, we can compare quoted SIM-only options from EE, Vodafone, O2 and Three. Availability and pricing depend on the provider, account and contract terms. This means:
- We can often secure 10-line pricing for businesses with just 5 lines
- Our volume aggregation means your 10-line order benefits from our total monthly volume across all clients
- Networks give us exclusive promotional rates that are not available to direct customers
- We handle the entire negotiation, you tell us your requirements and we present the best options
Get a free bulk SIM only quote. tell us how many lines you need and what data allowances, and you'll get tailored options from all four networks.
Comparing SIM Only to Other Options
SIM Only vs Pay As You Go (PAYG)
PAYG plans have no monthly commitment, you top up credit and pay per minute, text, and megabyte. While this sounds flexible, PAYG is almost always more expensive per unit than SIM only for regular business use. PAYG makes sense only for rarely-used emergency phones or very occasional-use devices.
| Factor | SIM Only | PAYG |
|---|---|---|
| Monthly cost | Fixed and predictable | Variable |
| Cost per GB | Lower | Higher |
| Cost per minute | Included (unlimited) | Charged per minute |
| Predictability | High | Low |
| Best for | Regular business use | Emergency/backup phones |
SIM Only vs Mobile Broadband
If your primary need is data (rather than calls and texts), mobile broadband SIMs (designed for routers and dongles) may offer better value per gigabyte. However, they do not include voice or SMS capability.
| Factor | SIM Only (Phone) | Mobile Broadband SIM |
|---|---|---|
| Calls & texts | Included | Not included |
| Data value | Good | Better (data-only) |
| Device | Phone | Router/dongle/tablet |
| Best for | Employee mobile phones | Office backup broadband, vehicle WiFi |
For businesses considering mobile broadband as an office backup or alternative to fixed-line, see our business mobile plans comparison.
If you are weighing up SIM only against handset contracts, see how the deals compare across EE, Vodafone, O2 and Three on our dedicated comparison page.
Frequently Asked Questions
How much can I save by switching to business SIM only?
Most businesses save meaningfully on their monthly mobile costs by switching from handset contracts to SIM only deals. A business with 10 lines can save a substantial amount each month, and even more each year, simply by dropping the handset element from the bill. The savings are even greater if your previous contracts have expired and you are still paying the bundled rate.
Will my coverage change if I switch to SIM only?
No. SIM only plans use exactly the same network infrastructure, coverage, and signal strength as handset contracts. If you stay on the same network, your coverage is identical. If you switch networks, coverage will change based on the new network's infrastructure, always check coverage at your key locations before switching.
Can I get a flexible short-term SIM only contract for my business?
Yes. All four major UK networks offer flexible short-term SIM only contracts for business customers. These cost slightly more per month than a 12-month contract, but give you the flexibility to cancel, switch, or change plans at short notice.
How do I transfer my business numbers to a new SIM only provider?
Text PAC to 65075 from each phone to receive a Porting Authorisation Code. Give these PAC codes to your new provider when ordering SIM only plans. The switch happens within one working day with minimal interruption. For bulk transfers (5+ lines), your new provider or a comparison service can coordinate all ports simultaneously.
Is eSIM available for business SIM only deals?
Yes. All four major UK networks support eSIM for business SIM only plans. eSIM eliminates the need for a physical SIM card, your plan is downloaded directly to compatible phones (iPhone XR+, Samsung S20+, Google Pixel 3+). Activation is instant, and eSIM allows dual-SIM capability alongside a physical SIM.
Can I mix SIM only and handset contracts on one business account?
Yes. Every major UK network allows you to have a mix of SIM only lines and handset contract lines on a single business account. This is often the most practical approach. SIM only for employees with working phones, and handset contracts for those who need new devices.
What is the difference between consumer and business SIM only deals?
Business SIM only plans typically include: dedicated business customer service lines, access to business admin portals for managing multiple lines, multi-line discounts, spend management tools, and sometimes enhanced features like priority support or business roaming packages. The underlying network and data allowances are the same.
Do I need to unlock my phone to use a SIM only deal from a different network?
Yes, if your phone was purchased from a specific network, it may be locked to that network. You will need to request an unlock before inserting a SIM from a different provider. Most networks unlock phones for free, contact your current provider to request it. Phones purchased SIM-free are already unlocked.
Are there any early termination fees for SIM only contracts?
For flexible short-term contracts, there are no early termination fees; you simply give notice as set out in your terms. For 12-month contracts, early cancellation typically incurs a fee equal to the remaining monthly payments on the contract. Always check the specific terms before signing.
Can I get business SIM only deals for tablets and data devices?
Yes. All four networks offer data-only SIM plans for tablets, laptops, and mobile broadband devices. These are typically cheaper than phone SIMs because they exclude voice and text, making them a cost-effective choice for data-hungry devices.
Ready to Switch to SIM Only?
Switching to business SIM only deals is one of the simplest ways to reduce your mobile spend, and with flexible short-term options available, there is no risk in trying it.
At Compare The Networks, we have been helping UK businesses make the switch. We are UK-based, reviewed on Trustpilot, and our comparison service is completely free.
Here is what we will do:
- Compare SIM only deals across EE, Vodafone, O2, Three, and MVNO partners
- Negotiate multi-line discounts based on your team size
- Calculate your exact savings vs current contracts
- Handle the entire switch. PAC codes, number porting, and SIM delivery
- Review your plan annually to ensure you stay on the best available deal
Get your free business SIM only quote today. tell us how many lines you need and you'll get a recommendation from all four networks.
Compare The Networks is a trading name of Xtra Phones UK Ltd, a UK-based comparison service. We compare business mobile options from EE, Vodafone, O2 and Three.