Business Phone Number Porting: How to Keep Your Number When Switching Providers

Jump to:

• What Is Number Porting?
• How the Process Works
• How Long Does Porting Take?
• What You Need to Start a Port
• Common Problems and How to Avoid Them
• What Happens During the Port
• Tips for a Smooth Port
• Frequently Asked Questions

What Is Number Porting?

Number porting is the process of transferring a phone number from one carrier or provider to another. It’s regulated by the FCC, which requires carriers to allow number porting. Your phone number belongs to you, not your carrier. They can’t refuse to release it.

When you port a number, the number itself doesn’t change. What changes is which carrier delivers calls to that number. Before the port, AT&T (or whoever your carrier is) routes calls to your number. After the port, your new VoIP provider routes those same calls. The cutover happens in minutes, and callers never know the difference.

Porting works for local numbers, toll-free numbers, and fax numbers. It works across different technologies: landline to VoIP, VoIP to VoIP, cell phone to business VoIP, and vice versa.

How the Process Works

Step 1: You request the port with your new provider. You fill out a Letter of Authorization (LOA) that gives your new provider permission to take over the number. You provide your current carrier’s account information so the new provider can submit the port request.

Step 2: Your new provider submits the port request to your old carrier. This is carrier-to-carrier communication. You don’t need to call your old carrier to initiate the port. In fact, you should not cancel your old service before the port completes. Your old number needs to be active for the port to work.

Step 3: Your old carrier reviews and confirms the port. They verify the account information, check the LOA, and either approve or reject the request. Rejections happen when the information doesn’t match (wrong account number, wrong authorized name, wrong PIN).

Step 4: A port date is scheduled. Once approved, both carriers agree on a date and time for the cutover. This is called the Firm Order Commitment (FOC) date.

Step 5: The port completes. On the FOC date, the number switches to your new provider. Calls to your business number now route to your new phone system. The actual cutover takes minutes.

How Long Does Porting Take?

The timeline depends on what type of number you’re porting and which carriers are involved.

Landline to VoIP: 7 to 15 business days. Traditional carriers process port requests more slowly than modern VoIP providers.

VoIP to VoIP: 5 to 10 business days. Both sides are set up for electronic port processing, so it goes faster.

Cell phone to VoIP: 1 to 5 business days. Wireless carriers generally process ports the fastest.

Toll-free numbers: 7 to 15 business days. Toll-free porting goes through a separate system called the Responsible Organization (RespOrg) transfer process.

Multiple numbers (bulk ports): If you’re porting 10 or more numbers simultaneously, add extra time. Bulk ports require coordination and are typically scheduled for a specific cutover window.

These timelines assume the port request is accepted on the first submission. If the request is rejected and needs to be resubmitted with corrected information, add another 5 to 10 business days.

What You Need to Start a Port

Gather this information before you contact your new provider:

Your current carrier’s account number. This is on your phone bill. Not the phone number. The account number. They’re different.

The authorized name on the account. This needs to match exactly. If the account says “John R. Smith” and you write “John Smith,” the port can be rejected.

Service address on the account. The physical address associated with the phone service. Again, it must match your carrier’s records exactly.

Account PIN or password. Many carriers require a PIN to authorize account changes. If you don’t know yours, call your carrier and set one before starting the port process.

A recent phone bill. Your new provider may ask for a copy of your latest bill to verify the account information and the numbers being ported.

The phone number(s) to port. List every number you want to transfer, including main lines, direct lines, fax numbers, and toll-free numbers.

Common Problems and How to Avoid Them

Port Rejection: Information Mismatch

The number one reason ports get rejected: the information on the LOA doesn’t match the old carrier’s records. Account name, address, account number, or PIN is wrong. Prevention: get a current bill from your old carrier and copy the information exactly.

Port Rejection: Account Has a Freeze

Some carriers place a “port freeze” on accounts that prevents numbers from being ported out. This was originally designed to prevent unauthorized porting (slamming) but sometimes catches legitimate port requests. Call your old carrier and ask them to remove any port freeze before submitting the port request.

Canceling Old Service Too Early

If you cancel your old carrier’s service before the port completes, the number goes back to the carrier’s pool and may be reassigned. Never cancel your old service until the port is confirmed complete and working on the new system.

Partial Port When You Have Multiple Numbers

If you have five numbers on one account and only want to port three, the old carrier may need to split the account. This can cause delays. Make clear upfront which numbers are porting and which are staying.

Contract Penalties

Some carriers charge an early termination fee if you port out before your contract ends. Check your contract terms before starting the port. In most cases, the savings from switching to VoIP offset the termination fee, but you want to know about it in advance.

What Happens During the Port

While the port is in progress (before the FOC date), your phones continue working normally on your old system. Your old number keeps ringing at your old location. Nothing changes until the actual cutover.

On the FOC date, the cutover happens. Within minutes, calls to your number switch from your old carrier to your new provider. Your old phones stop ringing. Your new phones start ringing. If everything is set up correctly, there’s zero downtime.

If you’re concerned about missing calls during the cutover, schedule it for a low-volume time: early morning, late afternoon, or over a weekend. Your provider can coordinate the timing.

Tips for a Smooth Port

Start early. Don’t wait until your installation date to begin the port process. Start it 2 to 3 weeks ahead. That way, the port completes around the same time your new system is ready.

Keep both systems running. Until the port is confirmed complete, keep your old service active. Overlap of a few days is normal and expected.

Test immediately after cutover. As soon as the port completes, call your business number from a cell phone and verify it rings your new system. Test transfers, voicemail, and auto attendant.

Update E911 information. After the port, verify that your business address is correctly registered for E911 on the new system. This ensures emergency dispatchers receive the right location information when someone dials 911.

Let your provider handle it. The porting process involves paperwork, carrier coordination, and technical configuration that your phone provider does every day. When Phonewire installs a phone system, we handle the entire porting process: we collect your account information, submit the LOA, track the port status, coordinate the FOC date with your installation, and verify everything works after cutover.