What is the best new business mobile plan for a company just starting out?
For most firms in their first year, the best new business mobile plan is a small one: a few lines, SIM only if your team already has phones, on a contract short enough that you can change it as the business grows. Start with what you need now, not what you hope to need in three years.
That fits what we see. In our own data, 81.5% of business mobile buyers chose 1 to 4 lines, and 91.2% chose fewer than 10 (Switcheroo data, 4,081 leads, 1 Nov 2025 to 31 Oct 2026). Our post on why most business mobile buyers have fewer than 10 lines has the full breakdown.
The rest of this guide covers how to size the plan, how long to sign for, and which rules protect a small company when it signs its first new business mobile contract.
How many lines should a new business start with?
Count the people who need a work number today, then add a line to your new business mobile plan only if someone is joining soon. Each extra line adds to the monthly bill, and a line nobody uses is money spent on nothing.
Think about who actually needs a work phone. A sole trader may only need one line. A small team that works from one site may need a phone for each person who deals with customers.
Check how the plan handles adding lines later. A new business mobile plan that lets you add a line part way through, without restarting the whole contract, gives you room to grow without paying for it up front.
SIM only or handsets for a start-up?
If your team already has phones that work, a SIM only new business mobile plan keeps the monthly cost down because you are paying for airtime and not for handsets. Ofcom notes in its consumer switching guide that SIM-only deals are usually the best value if you already have a phone.
Handsets on the plan make sense when staff need a separate work phone, or when you want every device set up and managed the same way. Spreading the handset cost can help cash flow in the early months. Just add up the total cost over the whole term, not just the monthly figure. Our guide to SIM only versus handset plans for small businesses goes into the trade off.
Data is the other big choice. A sharer or pooled plan lets several lines draw from one allowance, which can suit a small team whose use varies from person to person. Our guide to business mobile sharer plans explains when pooling pays.
How long should your first business mobile contract be?
Shorter is usually safer for a new business mobile contract. In your first year, you may not know how many people you will employ by the end of it, or how much data they will use.
Ofcom’s General Conditions that protect business customers say providers must offer at least one 12 month contract for each service. That option has to be there for every business, whatever its size.
If your business has 10 employees or fewer, you get extra protection. Ofcom says no phone or broadband contracts should be offered with a commitment period longer than 24 months, and buying extra services or equipment should not extend an existing contract without your consent.
What rules protect a small company signing its first plan?
Several of Ofcom’s rules are aimed at small firms. They are worth knowing before you sign a new business mobile deal.
Your rights at a glance
- With 10 employees or fewer, you should get a one page contract summary before you give consent, and key contract information such as the charges and the length of the contract in writing before you are bound.
- If the provider changes your contract in a way that is not to your benefit, it must give you at least one month’s notice and let you leave without a penalty. This one applies to every business.
- You must be sent end of contract notifications and annual best tariff notifications, so you know when your deal is up.
- Any price rise written into a new contract must be shown in pounds and pence before you sign, with the date it applies. This protection covers small business and microenterprise customers rather than every business.
- With 10 employees or fewer, the provider needs your consent before it renews the contract at the end of a commitment period.
The price rise rule came in on 17 January 2025, when Ofcom banned inflation-linked and percentage-based rises in new contracts. It means you can put the real cost of year two into your budget from the start.
One more rule helps a firm with 10 employees or fewer: the provider must tell you when a service included in your tariff plan is fully used up, along with the charges that apply beyond the plan. That is useful on a new business mobile account, when nobody yet knows how much data the team will get through.
Moving numbers and switching later
If you want to bring an existing number across to your new business mobile plan, Ofcom’s rules say your switching code must be provided free of charge, and that you can still transfer your old number to your new service within one month of cancelling.
Ofcom’s mobile switching rules apply to switches involving fewer than 25 mobile numbers. The time limits for getting a code are looser on business tariffs than on residential ones: for a single number requested by phone, the code comes immediately over the phone, or by text within two hours of the end of the call, and a request made by text can take up to two working days. A code is valid for 30 calendar days. Your old provider must not include charges for any notice period after the switching date.
Ask your new provider what checks it runs on a new company before you apply, so there are no surprises on the day.
Frequently asked questions about a new business mobile plan
- Do I need a business mobile plan or will a personal one do?
- Either can work for a very small firm. A business plan keeps work costs and numbers separate, which can make accounts simpler as you grow.
- What is the longest contract a small business can be put on?
- If you have 10 employees or fewer, Ofcom says providers should not offer a phone or broadband contract with a commitment period longer than 24 months.
- Can I add lines later without a new contract?
- It depends on the provider. Ask before you sign whether adding a line restarts or extends your contract. For firms with 10 or fewer employees, Ofcom says buying extra services or equipment should not extend the contract without your consent.
- Can my business mobile price go up mid contract?
- A rise can be written into a new contract, but it must be shown in pounds and pence before you sign. Any other change that is not to your benefit needs a month’s notice and gives you the right to leave without a penalty.
- How long does it take to get a switching code for a business line?
- For a single number requested by phone, immediately on the call or by text within two hours of the end of it. A request by text can take up to two working days. The code lasts 30 calendar days.
Sources
- Switcheroo data, business mobile journey, number of lines chosen, 4,081 leads, 1 November 2025 to 31 October 2026. Supports the 81.5% and 91.2% figures.
- Ofcom, General Conditions that protect business customers, published 6 March 2024. Supports the 12 month contract option for all businesses, the 24 month commitment limit and the consent needed to extend a contract for firms with 10 employees or fewer, the contract summary and key contract information, the one month notice of detrimental changes, the end of contract and annual best tariff notifications, consent before renewal, and notification when an allowance is used up.
- Ofcom, Ofcom bans mid-contract price rises linked to inflation, published 19 July 2024. Supports the 17 January 2025 ban and the pounds and pence requirement.
- Ofcom, Switching mobile phone provider. Supports SIM-only value if you already have a phone, the free switching code, transferring a number within one month of cancelling and the ban on notice period charges after switching.
- Ofcom, General Condition C7 switching extract. Supports the fewer than 25 mobile numbers threshold, the business tariff code time limits and the 30 calendar day code validity.
Checked 10 November 2026.
