5 steps to port your number without service interruptions

If you want to switch providers without losing your number, plan the port, check the services linked to that number and coordinate the change with both providers. This reduces the risk of customers reaching an inactive line or calls failing to connect.

In short:

• Number porting lets you keep your phone number when you change providers.
• Checking the account holder, the numbers being ported and any linked services reduces the risk of errors during the change.
• Coordinating the request, configuration, activation date and testing helps prevent call interruptions.
• The time required depends on the type of number, the documentation and coordination between providers. Confirm it before announcing a date.

Treat number porting and cloud PBX setup as separate tasks. Both need to be ready before you cancel your previous service.

What does number portability keep when you change provider?

Number portability lets you keep a phone number when you change provider. It does not automatically move your phone system, associated lines, call forwarding or office connection. You need to check and configure each one with the new provider so calls reach the right place.

The number is what your customers know. The line carries the calls. The PBX (business phone system) manages extensions, call queues, opening hours and call forwarding. These parts work together, but they are not the same thing.

When you change provider, your contract, tariff, PBX settings, phone equipment or office connection may change. Check whether other services depend on the number too, such as alarms, fax machines, payment terminals or backup lines.

Before requesting the change, review virtual business numbers and list each number, what it is used for and which service handles its calls. That tells you what will be ported and what needs to be set up again.

What should you check before requesting number portability?

Before you start, check whose name is on the account, which numbers and number ranges you want to move, and which services depend on them. Confirm what information the new provider needs to process the request without errors or rejections. Assign one person to coordinate the move.

Before submitting the request, gather:

• Account details and documents: check that the account holder’s details match the provider’s records and prepare any identification the provider requires.
• Numbers to move: list every number, number range and backup line. Identify any that must stay with the current provider.
• Connected services: note the PBX, call forwarding, alarms, payment terminals, fax machines and any other service that uses those lines.
• Bills and contract: keep copies of your bills and review cancellation terms and linked services.
• Owner and plan: assign one person to coordinate providers, documents, dates and any problems that arise.

If you are still comparing providers, use these criteria to choose a phone provider.

How do you port numbers without interrupting calls?

To avoid interruptions, coordinate the porting request, the new service setup, the changeover window, and tests of incoming and outgoing calls before cancelling the old service. Assign one person to manage the change and keep a fallback plan active throughout.

Follow this order:

1. List every number and its dependencies. Map each number to its extensions, call queues, forwarding rules, alarms, payment terminals, and backup lines.
2. Choose a provider and set up the destination. Confirm how calls will be routed in the cloud PBX.
3. Submit the paperwork. Check that the account holder’s details and the numbers in the request match the current provider’s records.
4. Agree on a changeover window. Set the date, name an on-call contact, and establish a way for both providers to communicate.
5. Test before closing the change. Make incoming and outgoing calls, check extensions, and verify forwarding before cancelling the old service.

Record the result of each test. If a call fails, keep the fallback plan in place and report the fault before treating the change as complete.

How long does number portability take?

The time it takes to port a number depends on the type of number, whether your documents match the current provider’s records, approval of the request and coordination between providers. Get the date confirmed in writing before you tell your team or plan the change.

Before agreeing to a date, ask the new provider for:

• The expected timeframe for each number or number range.
• Any outstanding documents and who will check them.
• The date the new service will be set up.
• The planned window for activating the port.
• The procedure if the request is rejected or delayed.

Porting your numbers is not the same as changing your entire phone service. If you are also changing your office connection, coordinate both changes and check the fibre and mobile connections your phone system uses. Keep your previous provider informed until you have checked incoming and outgoing calls on the new service. That way, you can update your team without announcing a change before it is confirmed.

What should you do if number portability fails or incoming calls stop?

If a number port fails, keep your previous provider’s service active. Check call routing and forwarding, document each issue, and ask the new provider to confirm the number’s status. Share an alternative number only if calls still cannot get through and the business needs an immediate way to be reached.

Follow these steps:

• Do not cancel the previous service yet. Keep it as a backup until you have confirmed the new service works.
• Call the number from outside the company, then from an internal line. This will help you locate where the call route breaks.
• Check call forwarding, opening hours, extensions and the numbers linked to the new service.
• Report the issue in writing. Ask for the number’s exact status, the cause of the failure and the next step.
• Share an alternative number only if the outage continues and no other channel is working.

Log the affected calls, the time and each provider’s response. Once service is restored, AI call analysis can help you review which calls came through, which were missed and which reasons recur.

Frequently asked questions

Can I port several business numbers at once?

Yes, you can request several numbers in one port, provided the provider confirms that each number is correctly identified and can be processed together. Prepare a list of individual numbers, number ranges, extensions and associated services. Ask for written confirmation of which numbers are included and which are not.

What happens to my numbers if I also change my cloud PBX?

You can keep your numbers while changing your cloud PBX, but you will need to set up extensions, call queues, forwarding, opening hours and call rules again. Before the change, document your current setup and decide how each number should work on the new system. Afterwards, test incoming and outgoing calls from different devices.

Do I need to tell customers about the port?

Not necessarily, if your numbers continue to work as normal. But prepare a notice if you expect a switchover period, call forwarding or a temporary alternative number. Tell the teams that answer calls first. Then update invoices, email signatures, websites and profiles that display your numbers.

Can I keep a geographic number if I move offices?

It depends on the number, the new address and the rules that apply to the move. Before announcing the change, ask your provider whether you can keep the number at the new location. If you cannot, arrange an alternative, such as another number or call forwarding, and update the places where customers find your contact details.

When should I cancel my contract with my previous provider?

Cancel only after you have confirmed that your numbers work with the new provider and that no services still depend on the old line. Check the cancellation terms, equipment, call forwarding and any associated services. Ask for written confirmation that the account is closed to avoid administrative problems later.

Ask a telecom provider to review your numbers and plan the port

Sources

• Especificación técnica de los procedimientos administrativos de la portabilidad fija — CNMC — 2020-11-01
• Especificación técnica de los procedimientos administrativos de la portabilidad fija — CNMC
• Ley 11/2022, de 28 de junio, General de Telecomunicaciones — BOE — 2022-06-28
• Ley 11/2022, de 28 de junio, General de Telecomunicaciones — BOE — 2022-06-28
• Circular 1/2012, sobre solicitudes de conservación de numeración — BOE — 2012-03-16
• DT 2006/733 Modificación Num. Geográfica WO c/ Marina 16-18 — CNMC
• Directiva (UE) 2018/1972 por la que se establece el Código Europeo de las Comunicaciones Electrónicas — BOE — 2018-12-11