Porting a business phone number means transferring it from your current carrier to a new provider. You submit a Letter of Authorization and a copy of your latest bill, the providers exchange paperwork, and 1 to 2 weeks later the number rings on the new system. Your number stays live during the entire port.
That last sentence deserves repeating, because it is the fear that keeps businesses on carriers they dislike: the number keeps working the whole time. The old service runs until the moment of cutover, and the cutover itself takes minutes. Done right, your callers never notice anything happened.
Your number is yours: the right to port
US carriers are required by FCC local number portability rules to release your number to another provider when you request it. Your current carrier cannot refuse because you are under contract, owe a balance, or asked them nicely to stop you (they can still bill you for early termination separately, but they cannot hold the number hostage). Toll-free numbers are portable too, under their own resporg transfer process, which behaves similarly from your side.
The paperwork, decoded
Two documents do all the work:
LOA: Letter of Authorization
A one-page form, usually signed electronically, in which the number's owner authorizes the new provider to request the transfer. It lists the number(s), the business name, the service address, and an authorized signature. Your new provider generates it; you sign it.
CSR: Customer Service Record
The account file your current carrier holds: exact business name, service address, account number, and the transfer PIN if one exists. The single biggest cause of porting delays is the LOA not matching the CSR letter for letter. "Corewood Roofing LLC" versus "Corewood Roofing, L.L.C." is genuinely enough for a rejection, so pull your latest bill (which mirrors the CSR) and copy from it exactly.
The timeline, step by step
| Stage | Who acts | Typical time |
|---|---|---|
| 1. Submit port request + LOA + bill copy | You + new provider | 10 minutes |
| 2. New provider files with the losing carrier | New provider | 1 to 2 days |
| 3. Losing carrier validates against the CSR | Old carrier | 2 to 5 days |
| 4. Firm order commitment (FOC) date assigned | Both carriers | Set for a few days out |
| 5. Cutover on the FOC date | Automatic | Minutes |
Total: usually 1 to 2 weeks for a standard business number, occasionally faster for simple wireless numbers and slower for complex multi-line accounts. Reputable providers, Phoner among them, port numbers in for free and give you a temporary number instantly, so you can build your phone menu and install the business phone app on everyone's device while the port runs, then swap the ported number in on cutover day.
Common rejection reasons (and the fixes)
- Name or address mismatch. The LOA does not match the CSR. Fix: copy from the latest bill character for character, including suffixes like LLC.
- Missing or wrong account number or PIN. Wireless and some VoIP accounts require a transfer PIN. Fix: request the PIN from the old carrier before submitting.
- Number listed under a different entity. Common after rebrands or when an employee signed up personally. Fix: update the record with the old carrier first, or have the actual owner sign the LOA.
- Frozen or locked account. Some carriers offer port-freeze protection and some apply it silently. Fix: call the old carrier and ask them to remove the freeze.
- Pending orders on the account. An open service change blocks the port. Fix: let the pending order complete or cancel it.
A rejection is not a disaster; it resets the request by a few days. The fix-and-resubmit loop is why tidy paperwork up front matters.
Cutover day: a 20-minute checklist
- Confirm the number rings the new system (call it from a personal cell).
- Check outbound caller ID shows the right name and number.
- Test the phone menu, ring groups, and voicemail greetings on the ported number.
- Send and receive a text message if the number is text-enabled (SMS sometimes trails voice by a day or two; that is normal).
- Only then cancel the old service. Cancelling early is the one way to genuinely lose a number, so it is always the last step.
Should you port or just forward?
Forwarding the old number to the new system works today and defers the paperwork, but it leaves you paying two providers and keeps your number's fate tied to the old account. Porting ends the relationship cleanly and brings the number under a modern system's control: routing rules, texting, voicemail-to-text, the lot. If you are still choosing that destination system, our overview of business phone service compares what the plans actually include, our guide to getting a business phone number covers the provider checklist, and VoIP vs landline explains what changes when you leave copper.
On Phoner, number porting is free, our team handles the carrier paperwork after you sign the LOA, and the status of your port is visible from day one. However you do it, the summary stands: two weeks, one signature, zero downtime.
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Get your business number
Phoner is a business phone system with number porting built in: a local or toll-free number your whole team can answer, with an IVR menu, voicemail-to-text, and routing from $15 per user per month. No hardware, no contracts.