In short
A business SIM is held on a business account, so the business owns the number and the account controls; a personal SIM belongs to an individual. Business plans are priced ex VAT, with spend caps and many lines on one bill. A personal SIM can work for one person; a growing team usually needs a business account.
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Tell us about your users, systems and priorities and we will tell you which option fits, and why.
Can I use a personal SIM for work?
Yes, you can make work calls on a personal SIM, and many sole traders start that way. Nothing stops a phone on a personal plan from being used for business. The question is whether it is the right arrangement for your business, and the answer usually changes as the business grows.
The main issues are ownership and control. A personal SIM belongs to the person who took out the contract. The number, the account and the decisions about them are theirs. That is fine when the person and the business are the same, but it becomes a problem when a number your customers know is tied to an employee, or when you need to manage several lines and their costs together. Networks also separate the two: Three Business, for example, sells business plans to business owners and the self-employed and points everyone else to its personal plans.
Business SIM vs personal SIM compared
| Area | Business SIM | Personal SIM |
|---|---|---|
| Account holder | The business | An individual |
| Who controls the number | The business, through the account | The individual who holds the contract |
| Terms | Business terms and conditions | Consumer terms and conditions |
| Prices | Normally shown ex VAT | Normally shown including VAT |
| Lines | Many lines on one account and bill | Usually one line per contract, or a family plan |
| Account controls | Spend caps, roaming settings, usage by line, online account tools | Controls for the individual line |
| Eligibility | Business owners, the self-employed and organisations | Individuals |
The details vary by network and plan, so treat this as the general picture rather than any one network's terms.
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Tell us what matters most to you and we will recommend one, with the trade-offs explained.
Who owns the number when staff leave
This is the difference that matters most to most businesses. If an employee uses their own personal SIM for work, the number is theirs. When they leave, it goes with them, along with every customer, supplier and colleague who has it saved. You cannot stop them taking it, and you cannot move it to their replacement.
On a business account, the number belongs to the business. When someone leaves, the line stays on the account. You can give the number to their replacement, keep it active so calls are not missed, or move it to another network with a PAC code requested through the account. For any role where customers ring a mobile number, that control is worth having. Our page on fleet SIM cards suggests a simple handover routine for joiners and leavers.
Terms, eligibility and VAT
Business and personal plans are sold under different terms. Business terms are written for organisations and can differ from consumer terms, so read the terms for the plan you choose. Networks decide who can buy business plans; as noted above, Three Business sells them to business owners and the self-employed.
Business prices are normally shown ex VAT, so when you compare a business plan with a personal one, put both on the same basis before deciding which is cheaper. Whether you can reclaim VAT, and how a phone used for both work and personal calls is treated, are questions for your accountant. Our sister site's guides to business mobile cover company phones and how they fit with personal use.
Weighing up the options?
We can compare them against your own requirements and recommend what fits.
Using one phone for work and personal numbers
If staff use their own phones for work, you do not have to choose between a personal SIM and carrying two handsets. Many phones support dual SIM, usually a physical SIM plus an eSIM, so a business eSIM can sit alongside the person's own number on one device. EE Business describes this for bring-your-own-device arrangements, and Three Business explains that a dual SIM device can run two numbers on one phone (two eSIMs, or an eSIM and a physical SIM); to use two different networks the phone must be unlocked.
That gives the business ownership of the work number while the employee keeps their own phone. It does raise questions about company data on a personal device, so it is worth having a clear policy and, where needed, mobile device management or mobile security software. Our guide to eSIM SIM only covers setting up a business eSIM.
When to move from a personal SIM to a business SIM
- You take on staff: their work numbers should belong to the business from day one
- Customers know the number: if a mobile number is part of how customers reach you, the business should own it
- You have more than one line: phones, tablets and routers are easier to manage on one account
- Costs need controlling: spend caps and usage reports help stop surprises
- You want business terms and ex VAT pricing: so your phone costs sit cleanly in your business accounts
Moving an existing number from a personal plan to a business plan on a different network uses the normal PAC process. Moving it to a business account on the same network is handled by that network, and the steps vary; ask us and we will confirm how it works for your number.
Getting a business SIM
If you have decided it is time for a business account, our guide on how to get a business SIM card walks through the steps. We supply business SIM only plans on EE Business and Three Business, and we can also supply O2 Business and Vodafone Business. We move your numbers across and set up the account controls.
Contact us and ask us for a quote. For background on what a business SIM includes, see business SIM cards.
How Forever Communications helps with business SIM only
We help UK organisations choose, switch and run business SIM only plans, data SIMs and eSIMs for the phones and devices they already own.
- Start with what you have: we look at your current contracts, end dates, users, devices and how much data people really use before suggesting anything new
- More than one network: we supply SIM only plans on EE Business and Three Business, and we can also supply O2 Business and Vodafone Business, so you can choose by coverage where your people work
- Keep your numbers: we help you plan the move with PAC codes or STAC codes so existing business mobile numbers come with you
- SIMs for every device: voice SIMs, eSIM SIM only that works with your device management, business data only SIMs for tablets, routers and vehicles, and fleet SIM cards on one account
- Controls that suit a business: we can help you set up spend caps, bars and user changes through the network's own business tools
Forever Communications is part of Forever Group. Plans, terms and pricing are confirmed at quote, so contact us and we will set out the options that fit.
Frequently asked questions
Can I use a personal SIM for my business?
Yes, nothing stops you making work calls on a personal SIM, and many sole traders start that way. The drawbacks are that the number belongs to an individual, prices include VAT and you have fewer controls for managing several lines.
What is the difference between a business SIM and a personal SIM?
A business SIM sits on a business account, so the business owns the number, the plan is under business terms and priced ex VAT, and you get account controls such as spend caps and many lines on one bill. A personal SIM belongs to an individual.
Who keeps the number when an employee leaves?
On a business account, the business keeps it and can reassign it. If the employee used their own personal SIM for work, the number is theirs and leaves with them.
Can I have a business number and a personal number on one phone?
Yes, on a dual SIM phone. A business eSIM can sit alongside a personal SIM on one device. To use two different networks, the phone must be unlocked.
Can a sole trader get a business SIM?
Yes. Networks sell business plans to the self-employed; Three Business, for example, sells business plans to business owners and the self-employed. You will be asked for your business details and the order is subject to the network's checks.
Still deciding?
Ask us and a member of our team will reply by email.
