How to Switch Your Business Mobile Provider

Loyalty rarely pays in the mobile market. If your business has been with the same provider for years, or your contract has quietly rolled past its end date, there’s a good chance you’re paying more than you need to. The good news is that switching business mobile provider is quicker and easier than most people expect, and you can keep every one of your numbers.

In this guide, we’ll walk through the switching process step by step, explain the codes you’ll need, and show you how to avoid the common pitfalls.

When Should You Switch Business Mobile Provider?

The obvious trigger is the end of your minimum term. Once your contract expires, most providers move you onto out of contract pricing, which is rarely competitive. If you don’t know when your contract ends, ask your provider; they’re required to tell you.

Other good reasons to switch include prices rising mid-contract, poor coverage where your team works, customer service that isn’t up to scratch, or simply finding a better deal elsewhere. If your provider increases prices in a way that wasn’t set out in your contract, you’re normally entitled to leave without penalty, something we cover in our guide to mid-contract price rises.

Before You Switch: Three Things to Check

Your Contract End Date and Exit Fees

If you’re still within your minimum term, your current provider can charge an early termination fee, usually based on the remaining months of your contract. Sometimes the savings from a better deal outweigh the fee, but do the sums first.

Coverage on the New Network

Signal strength varies between networks and locations, so check the new network’s predicted coverage at your premises and anywhere your team regularly works. Ofcom’s mobile coverage checker shows predicted indoor and outdoor coverage for every UK network, and our guide on how to check mobile coverage for your business explains how to test it properly.

Whether Your Handsets Are Locked

If your phones were supplied by your current provider, check they’re unlocked so they’ll accept the new SIMs. Phones sold since December 2021 must be sold unlocked, but older handsets may need unlocking first, which your current provider must do.

PAC and STAC Codes Explained

Switching in the UK is built around two codes, and Ofcom’s switching rules make both free and fast to get.

PAC: Keep Your Number

A PAC (Porting Authorisation Code) lets you take your existing number to your new provider. To get one, text PAC to 65075 from the phone in question. Your provider must reply within a minute with the code, along with details of any early termination fees or outstanding charges. The code is valid for 30 days.

STAC: Start Fresh with a New Number

If you don’t want to keep a number, request a STAC (Service Termination Authorisation Code) instead by texting STAC to 75075. This cancels the old service without porting the number.

For a business with many lines, texting from every handset isn’t practical. Most providers will issue PAC codes in bulk for all your numbers through their business support team or online account portal, so ask for a multi-line PAC request.

How to Switch: Step by Step

• Audit what you have: how many active SIMs, who uses them, how much data each line actually uses, and when the contract ends.

• Compare deals based on your real usage, not the allowances you were originally sold.

• Check coverage on the new network at the locations that matter to you.

• Request your PAC codes (or STACs for numbers you’re retiring).

• Give the codes to your new provider, who handles the rest, including cancelling your old contract. You don’t need to negotiate a cancellation with your old provider.

• Once the switch completes, check your final bill from the old provider, which should only cover service up to the switch date plus any agreed fees.

Will There Be Any Downtime?

Very little. Once you hand over a PAC, your number must be transferred within one working day. In practice, most numbers port during the working day with only a brief window, often an hour or two, where the old SIM stops working before the new one takes over. Calls and texts follow the number to the new SIM automatically.

To keep disruption to a minimum, ask your new provider to schedule ports for a quiet day, stagger large fleets across several days, and make sure everyone has their new SIM (or eSIM profile) installed and ready before their number moves. If you’re using eSIMs, activation can be even quicker; see our guide to eSIMs for business.

Common Switching Questions

Do I Have to Call My Current Provider to Cancel?

No. Handing your PAC or STAC to the new provider triggers the cancellation automatically. That’s the point of the text to switch system: no retention calls, no awkward conversations.

Can I Switch If I Still Owe Money on Handsets?

Yes, but any outstanding handset payments or early termination fees will still be due. The PAC text message must set out what you’d owe, so you can see the full cost before you commit.

Will Switching Affect My Number for WhatsApp, Banking and Two Factor Authentication?

No. Your number stays exactly the same when you port it with a PAC, so anything linked to it keeps working.

What If Something Goes Wrong?

Providers are required to compensate you if your switch is delayed or goes wrong through their fault. If a problem isn’t resolved, you can complain to the provider and escalate to an independent ombudsman after eight weeks.

Final Thoughts

Switching business mobile provider is one of the simplest cost savings available to a small business. The process is regulated, fast and free, your numbers move with you, and the whole thing usually takes less effort than a single supplier phone call used to. Before you switch, take the time to compare business SIM only deals based on what your team actually uses, and you could see the benefit on every bill from next month onwards.