How to port your business number to VoIP without losing calls

If customers already know your number, keeping it matters. The process of moving a number from one provider to another is called porting, and in many countries you have a right to keep your number when you change provider. Done carefully, customers never notice the switch.

What you need before you start

• The current account holder's name exactly as it appears on the bill.
• The billing address on the account.
• The account number and any PIN or passcode.
• A recent bill or other proof of ownership, if the provider asks.
• A list of every number you want to move.

The porting process, step by step

1. Confirm with your new provider that your number type and country can be ported in.
2. Do not cancel the old service. Cancelling too early can cancel the number.
3. Send the new provider your account details and sign the transfer request.
4. Wait for the old provider to release the number. Your provider will tell you the date.
5. Test calls as soon as the number is live, and update call routing if needed.
6. Cancel the old service only after the new number works.

How long does it take?

It depends on the country, the number type and how clean the paperwork is. Simple transfers can complete in a few business days, and complicated ones can take longer. Ask your provider for a realistic date and plan around it.

Common reasons a port is delayed

• The name or address does not match the old provider's records.
• The wrong PIN or account number.
• An unpaid bill or a contract hold on the old line.
• The number is on a shared or special line.

A safe plan

Get a temporary new number first, so your team can start calling right away. Move the old number when the paperwork is ready, and forward calls from the old number if possible during the change. Not every provider handles every number type, so ask early. If you are thinking about Dialsyx, talk to our team about your numbers before you decide.

Related: how to get a business phone number.

A sample porting timeline

Real dates differ by country and number type, but this shows the shape of the process: gather, submit, wait, test, then cancel.

What to do on port day

1. Make an incoming test call from a mobile phone.
2. Make an outgoing call and check the caller ID shown.
3. Check voicemail and call routing.
4. Tell your team the number is live and where to report problems.
5. Keep the old service for a short time as a safety net if your provider allows it.

Plan for the gap

Tell frequent callers if you will be briefly unreachable, and put a note on your website. If calls are critical, use a temporary number or call forwarding so nobody is stranded during the switch.