How to Port Your Business Number to VoIP
You can usually move your existing business number to a VoIP provider by submitting a port request with your current account details and a recent bill. The new provider handles the transfer with your old carrier. Keep your old service active until the port is complete, and make sure every detail on the request matches your current account exactly.
You can almost always keep your existing business number when you switch to VoIP. The process is called porting: you authorize your new provider to request the number from your current carrier, and once the transfer completes, calls to that number ring on your new system.
The work is mostly paperwork. Get the details right, keep your old service active until the port is done, and most ports go smoothly.
How number porting works
In the US, carriers are generally required to let customers take their numbers with them when they switch. Your new provider submits a port request to your current carrier on your behalf, using information you provide and a signed authorization.
Your current carrier checks the request against its records. If everything matches, the carriers agree on a date and the number moves. If anything does not match, the request is rejected and has to be corrected and resubmitted.
You do not have to contact your old carrier to "release" the number in most cases. You do have to make sure the information you give your new provider is accurate.
What you need before you start
Gather this information from your current carrier's account portal or a recent bill.
| Item | Why it matters |
|---|---|
| Full list of numbers to port | Including fax lines, extensions with direct numbers and any toll-free numbers |
| Account number | Must match the account that holds the numbers |
| Account PIN or passcode | Many carriers, especially wireless ones, require a port-out PIN |
| Authorized name | The person or business name on the account, exactly as the carrier has it |
| Service address | The address on file with the carrier, which may differ from your billing address |
| Recent bill | Many providers ask for a copy to confirm ownership |
If you are unsure about any detail, call or message your current carrier to confirm it. A small mismatch, such as "Street" versus "St." or an old suite number, can be enough to cause a rejection.
Step-by-step: porting your number
- Confirm portability. Before signing up, ask your new provider to check that your numbers can be ported to it. Most can, but some number types and locations need extra steps.
- Choose your new provider and plan. Our business VoIP ranking and guide to choosing a business phone system can help.
- Do not cancel your old service. Cancelling early can release your number, and you may not get it back. Keep everything active.
- Set up your new system first. Create users, build your call flow and record greetings. Many providers give you a temporary number so you can test.
- Submit the port request. Provide the details from the table above and sign the authorization, often called a letter of authorization (LOA).
- Watch for updates. The new provider will tell you if the request is accepted, rejected or needs more information. Respond quickly to avoid delays.
- Confirm the port date. Plan it for a quieter time if you can, and let staff know.
- Test on port day. Call your numbers from an outside phone, check the auto attendant and routing, and send a test text if you use business texting.
- Cancel the old service. Only after every number has ported and been tested. Ask your old carrier for a final bill and check for any early termination terms.
Porting many numbers or locations
If you have numbers across several locations or carriers, you may need separate requests for each carrier or account. Ask your new provider whether it offers help with larger ports. Providers that serve bigger deployments, such as RingCentral, Nextiva and 8x8, generally have processes for multi-number and multi-site moves.
You can also port in stages. Moving a single, less critical number first is a good way to test the process before you move your main line.
Business texting after a port
Porting moves the number for calls, but texting can need separate setup. In the US, business texting from software platforms generally requires registration before you can send messages at scale. Ask your new provider what registration it needs and how long it takes, and plan for texting to be ready on its own timeline.
Common porting problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Request rejected | Details do not match the carrier's records | Confirm account number, PIN, name and service address with your current carrier, then resubmit |
| Only some numbers ported | Numbers sit on different accounts or carriers | Submit a separate request for each account |
| Calls still ring the old system | Port has not fully completed everywhere yet | Wait for the provider to confirm completion, then test again |
| Number appears lost | Old service was cancelled before the port | Contact both carriers immediately; recovery is not guaranteed |
| Texts not working | Business texting not yet registered on the new provider | Complete the provider's texting registration |
Switching from a virtual number to a full system
If you started with a virtual number service such as Grasshopper and want to move to a full phone system like Ooma Office, the process is the same. Treat your current virtual number provider as the "old carrier" and request your account details and any port-out PIN from it. Our Ooma vs Grasshopper comparison explains when that upgrade makes sense.
Before you sign
Ask any new provider these questions:
- Can you confirm my numbers are portable before I commit?
- Is there any charge for porting?
- Do you offer a temporary number while the port is in progress?
- How do you handle toll-free and multi-location ports?
- What happens to my numbers if I leave you later?
The last question matters. You want to know you can port your numbers out again in the future.
The short version
Gather your account details, keep your old service running, set up the new system first and submit an accurate port request. Test thoroughly on port day, then cancel your old service. For more on how we evaluate providers, see how we rank.
Frequently asked questions
Will I lose my number if I switch to VoIP?
Usually not. Most US business numbers can be ported to a VoIP provider. Ask the new provider to confirm your number is portable before you sign up, and do not cancel your old service until the port is complete.
How long does porting a business number take?
It varies with the number type, the carriers involved and whether the request is accurate. Simple ports can be quick, while ports with many numbers or mismatched details take longer. Your new provider can give you an estimate for your situation.
Can I port a toll-free number?
Toll-free numbers can generally be ported, but the process is handled differently from local numbers. Ask your new provider about its toll-free porting process before you submit a request.
Why was my port request rejected?
The most common reason is that details on the request do not match your current carrier's records, such as the account number, PIN, authorized name or service address. Check those details with your current carrier and resubmit.