How to Port Your Business Phone Number: Step-by-Step Guide

Your phone number is on your signage, your invoices, your Google Business Profile, and in the contacts of every customer you have. So the single most common question we hear from businesses switching phone providers is: can I keep my number? The answer is yes, almost always, and it is backed by federal law. FCC local number portability rules require your current carrier to release your number to a new provider at your request. Your carrier cannot refuse to port your number because you have an outstanding balance or an active contract; any remaining balance or early-termination fee is a separate billing matter between you and them.

That said, porting is a process with paperwork, and most delays come from small, avoidable mismatches. This guide walks through exactly how it works, what documents you need, why ports get rejected, and how to cut over without missing a call.

The two documents that decide everything

The LOA (Letter of Authorization)

The LOA, sometimes called a Letter of Agency, is the signed form that authorizes your new provider to request your number from your current carrier. It is the legal instrument of the port. It must be signed by someone authorized on the account, and the business name and service address on it must match what your current carrier has on file. When you port to fvoip, we generate the LOA for you during signup; you review, sign, and we submit it.

The CSR (Customer Service Record)

The CSR is your current carrier's internal record of your account: the exact business name, the service address, the billing telephone number (BTN), and the list of numbers and features on the account. Ports are matched against the CSR, so the golden rule of porting is: make the port request match the CSR exactly, not what you think the account says. If the CSR says Smith Dental Assoc LLC at Ste 200 and your LOA says Smith Dental Associates, Suite 200, some carriers will reject the port over the difference. Before you start, call your current carrier and ask for a copy of your CSR, or at minimum read the exact name and address off your latest bill.

Step-by-step: how a business port works

• Step 1: Gather your account details. You need the exact business name and service address as the losing carrier has them, the account number, the BTN, and, if the account has one, the port-out PIN or passcode. Wireless and some cable carriers require a PIN; many issue a specific port-out PIN on request that differs from your login password.
• Step 2: Sign up with the new provider first. Porting moves a number onto an existing account, so your fvoip service gets set up before the port lands. This is a feature, not a chore: it means you can build your auto-attendant, record greetings, and install apps before your number arrives, and we forward or test with a temporary number in the meantime.
• Step 3: Submit the LOA and a recent bill copy. A bill copy is not always required, but including one resolves most name and address questions before they become rejections. Start the process on our porting page.
• Step 4: The carriers exchange the request. Your new provider's carrier partner submits a port request to the losing carrier, which validates it against the CSR. If everything matches, the losing carrier returns a firm order commitment (FOC) date: the scheduled day the number moves.
• Step 5: Cutover day. On the FOC date, the number routes to fvoip, usually within a defined window during business hours. Calls start arriving on your new system. Your old service for that number stops working at that moment.
• Step 6: Cancel the old service, after the port. This ordering is critical. If you cancel your old account before the port completes, the carrier can release or disconnect the number, and a disconnected number may not be portable at all. Wait until you have confirmed calls are arriving on the new system, then cancel remaining services on the old account.

Why ports get rejected (and how to avoid each one)

Roughly speaking, port rejections come down to a short list of causes. Every one of them is preventable:

• Business name mismatch. The most common cause. The LOA name must match the CSR character-for-character in spirit: legal name versus DBA, abbreviations, punctuation. Fix: pull the CSR first and copy it exactly.
• Service address mismatch. Carriers match on the service address, which is not always the billing address, and moves you made years ago may never have been updated. Fix: use the address from the CSR or the service-location line of your bill.
• Wrong or missing account number / BTN. On multi-line accounts, the BTN is the lead number the carrier bills under, and it may not be your main published number. Fix: read it off the bill.
• Missing or wrong PIN. Common with wireless and cable providers. Fix: call the losing carrier and ask for your port-out PIN before submitting.
• Port-out freeze on the account. Some carriers let you place a security freeze that blocks porting. Good against slamming, bad when forgotten. Fix: ask the losing carrier whether a freeze exists and remove it.
• Pending orders on the account. An open service order, a pending move, or a partially processed change can block a port until it clears. Fix: let existing orders complete before submitting.
• Partial-port complications. Porting some numbers off an account while keeping others requires the carrier to restructure the account, and requests that do not spell out which numbers stay can bounce. Fix: list remaining numbers explicitly and confirm the account can survive without the ported ones.

A rejection is not a dead end. The losing carrier returns a reason code, the request gets corrected and resubmitted, and the clock restarts. It typically costs a few business days per round trip, which is exactly why getting the CSR details right the first time matters.

Realistic timelines

The FCC requires simple ports (single number, matching info, no complications) to be completed quickly, and wireless-to-wireless ports routinely finish within a business day. Business landline and multi-line ports take longer because CSR validation is more involved. At fvoip, local business numbers typically port in 3 to 10 business days. Toll-free numbers work differently: they are moved between RespOrgs (the registered organizations that manage toll-free routing) rather than between local carriers, and typically take 10 to 15 business days. Complex ports (dozens of numbers, multiple locations, carrier account restructuring) can run longer; we flag those cases upfront.

Will I miss calls during the port?

No. This is the most persistent porting myth. Your number keeps working on the old carrier the entire time the port is in progress, and cutover happens in a short scheduled window on the FOC date. The number is never dark in between. The only way businesses lose service during a port is by cancelling the old account early, which is why we repeat it: cancel last, not first.

The fvoip porting checklist

• Pull your CSR or latest bill; note exact name, service address, account number, BTN, and PIN.
• Remove any port freeze; let pending orders complete.
• Sign up for fvoip and configure your system on a temporary number. Plans start at $21 per user per month; see pricing.
• Sign the LOA we prepare, attach a bill copy, and submit.
• Order or connect your desk phones so hardware is ready before the FOC date.
• On cutover day, place a test call in and out. Then, and only then, cancel the old service.

Porting is free at fvoip: no port-in fees, no setup fees, no contract. Our US-based support team has processed ports away from all the major carriers (Spectrum Business, Comcast Business, AT&T, Verizon, Frontier) and from cloud providers like RingCentral, Nextiva, and Vonage, and we handle the paperwork end to end. Start at fvoip.com/port.