Can I Switch Business Mobile Provider And Keep My Number?
Last Updated 10th of September 2026
7 minute readYes, you can change your business mobile provider and keep the same number. We explain each step in plain words, so you can move with less risk and keep calls flowing.
A UK business can switch mobile provider and keep its number by asking its current provider for a Porting Authorisation Code (PAC). Give the PAC to the new provider within 30 days. The number should normally move within one working day.
The basic move is simple, but a little care can stop lost calls, extra bills and staff stress. Read on to learn how to plan one line or a whole business fleet.
Keep your existing business number while moving to a plan that better suits your budget and needs. Click the link below to Switch Business Mobile Provider with minimal disruption.
Can I Switch Business Mobile Provider And Keep My Number?
Yes. Keeping a mobile number while you change provider is called mobile number porting. Your number moves from the old provider to the new one. Clients, staff and suppliers can still call the number they know.
For most UK switches, you need a Porting Authorisation Code, known as a PAC. Ask your current provider for it, then pass it to your new provider. A PAC is free and lasts for 30 days. If it runs out, ask for another one.
For one mobile number, text PAC to 65075 from the phone you want to move. The text is free. You can also ask by phone or through your online account. Your provider will send the code and key facts about your contract, such as any early exit fee.
Business accounts often hold more than one number. For two to 24 numbers, ask for a PAC through your online account or by phone. If you plan to move more than 24 numbers at once, contact your current provider. It will tell you which bulk port process to use. Businesses managing several users should also compare the account controls and shared allowances available with multi-SIM business mobile deals.
Do not cancel the old service first. Give the PAC to the new provider and let the providers manage the move. Using the PAC ends the old service for the number that moves. If you cancel too soon, you may add delay or put the number at risk.
Ofcom says a number should normally be ready on the new service within one working day after the new provider gets the PAC. The code does not end the old contract on its own. The end happens when the port is used and the switch completes.
The move is not always instant. On port day, calls, texts or mobile data may stop for a short time. A phone restart may help after the new SIM or eSIM takes over. Plan important calls around this short change window.
Your mobile number is only one part of the service. Voicemail, call groups, data sharing, roaming, spend limits and device plans may not move with it. Ask the new provider to rebuild any tools your team needs. Some of these features are specific to commercial accounts. If you are considering changing account type as well as network, review the differences between business and personal mobile contracts.
The right to port does not mean every old cost will vanish. You may still owe an early termination charge, a final bill or device payments. Check these before you agree to the new deal. A lower monthly price may not be a saving if the exit fee is high. Compare the total cost over the remaining and new contract periods—not just the advertised monthly rate. Our guide explains how to compare business mobile contracts.
You can text INFO to 85075 from a single line to check if it is still in contract and whether a charge may apply. For a shared business account, ask the account manager for a full line and device list. Check each end date, not just the main account date.
The safest plan links the port to a clear business need. Look at signal where staff work, data use, overseas calls, support hours and the price after any offer ends. A cheap plan with weak signal can cost more through missed calls and lost time. Before requesting a PAC, compare these factors carefully using our guide to choosing the right business mobile provider.
How Do I Move My Business Number Safely?
Start with a simple audit. Write down every mobile number, user, handset, SIM type, contract end date and key feature. Mark the numbers used for sales, alarms, bank checks, two-step login or emergency contact. These lines may need extra care.
Then test the new network. Coverage maps are useful, but real use is better. Try a SIM in the office, at home, on key roads and at client sites. Test calls inside buildings as well as outside. Ask field staff where calls often fail.
Use this checklist:
- Confirm who has the right to change the business account.
- Back up phone contacts, photos and any data held on the SIM.
- Check the old contract and all device payment dates.
- Order and test the new SIMs or eSIMs before the port.
- Ask for the right PAC for the number or group of numbers.
- Give the PAC to the new provider within 30 days.
- Agree a port date when staff support is on hand.
- Tell users what may happen and how to get help.
- Test incoming calls, outgoing calls, texts and data after the move.
- Check the final bill and close any services that did not move.
Tell staff which SIM to use and when. Label each SIM with the user or number. If eSIMs are used, make sure each phone can take the new eSIM and that staff have Wi-Fi for set-up.
On port day, keep both old and new SIMs close. The old SIM may work until the move starts. The new one may first show a temporary number, then change to the kept number. Restart the phone if asked.
Test from more than one network after the port. Call the number, send a text, use mobile data and check voicemail. Also test bank codes and other key alerts. Some services may need the number checked again even though the number stayed the same.
If a line fails, note the time, caller network and error. Give this detail to the new provider. Clear facts help its port team find a routing fault faster.
How Long Does a Business Mobile Number Port Take?
Once the new provider has a valid PAC, the number should normally move within one working day. Weekends and bank holidays can affect the date. Ask the new provider to confirm the planned port day.
The full project may take longer than one day. Buying phones, checking credit, setting up an account, sending SIMs and planning a large fleet all happen before the port. A bulk move can also need a special plan between the providers.
| Stage | Usual point | What the business should do |
| Check | Before ordering | Review costs, cover and end dates |
| Set up | Before port day | Receive and test new SIMs |
| PAC | Before the move | Request it and use it within 30 days |
| Port | Agreed working day | Keep users and support ready |
| Test | As soon as it moves | Check calls, texts, data and voicemail |
| Close | After success | Review the old provider’s final bill |
A short break in service can happen while network records change. Make a back-up route for vital calls. You could use a main office line, a second mobile, web chat or a temporary call message. Tell key clients only if the risk matters to them.
If the switch takes more than one working day, or the process is abused, Ofcom says you may have a right to reasonable compensation. Ask the provider how to claim. Keep screenshots, case numbers and a log of lost service.
Raise a fault with the new provider first, as it now leads the port. If the issue is not fixed, use its formal complaint process. The provider must tell you about its approved dispute resolution scheme when the case reaches the required stage.
What Can Go Wrong When I Keep My Number?
Most ports work well, but planning matters. The most common error is cancelling the old line before using the PAC. Another is giving the wrong PAC or account data to the new provider. Names, numbers and business details should match the old account.
A split port can also occur. Calls may reach the new SIM while texts or calls from one network still go to the old route. This is often temporary, but report it at once if it lasts. Give examples with times and the networks used.
Linked services can be missed. A business may have a device loan, insurance, shared data pot, watch plan or tablet SIM beside the main line. Porting one number may not close these items. Read the final bill line by line.
Security needs care too. A mobile number may receive login codes for email, banking, payroll and cloud tools. List these systems before the move. Make sure the named account owner and backup sign-in method are current. Never send a PAC to an unknown caller or email address.
Check that the phone will work on the new service. UK providers cannot sell locked handsets, but an older phone may lack useful bands, eSIM support, 4G calling or other features. Ask the new provider to check the exact model.
Be careful with timing near a contract renewal. If the PAC expires, request a new one. If a deal depends on a date, get written proof that the price will still apply. Never rush a fleet move just to meet a sales deadline. Before accepting the replacement agreement, check its minimum term, price changes, allowances and exit conditions. Use our checklist forsecuring the right business mobile contract.
There is also a useful safety net. If the old service has already been cancelled, Ofcom says you can still ask to keep the number for free within one month of cancellation. Contact the old provider for a PAC if it was not supplied. Act at once, as waiting may reduce the chance of a smooth recovery.
Ready to Keep Your Number and Find a Better Deal?
A good business mobile switch should cut cost or improve service without making clients learn a new number. Review your lines, check the real exit cost and plan the port with a provider that can support your team.
Click the link below to compare business mobile options and get help with your switch.
FAQ
Is it free to keep my business mobile number?
Yes. Asking for a PAC and porting the number should be free. You may still have to pay an early exit fee, a final monthly bill, unpaid use charges or the balance on a phone. Ask for a full cost list before moving.
Can I keep several business mobile numbers?
Yes. For two to 24 numbers, ask your current provider for a PAC online or by phone. For more than 24 numbers at once, contact the provider and follow its bulk port steps. Make a line list so no number is left behind.
Will I lose service during the switch?
You may have a short loss of calls, texts or data on port day. It should not last more than one working day. Keep a backup contact route for vital work and report any long or partial loss to the new provider.
Can I move my number while still in contract?
Yes, but the old provider may charge an early termination fee. Device payments may also remain due. Check the total cost against the saving from the new plan. Sometimes it is better to wait until the minimum term ends.
What happens if my PAC expires?
A PAC is valid for 30 days. If you do not give it to the new provider in time, ask the old provider for a new PAC. Your service should stay with the old provider until a valid PAC is used and the number moves.
Ready to Switch Business Mobile Provider without losing the number your customers already know? Click the button below to compare UK business mobile plans and start your number transfer.