How to port your business phone number to an AI answering service

Your business phone number is on your cards, your website, your Google listing, and every ad you have ever run. You are not going to change it just to try a new answering service. The good news is you do not have to.

When you switch to an AI answering service like Upfirst, your number stays yours. You have two options for connecting it: call forwarding or number porting. Forwarding lets you test things out without changing anything. Porting makes the move permanent. This guide covers both, step by step.

Call forwarding vs. number porting: which one do you need?

Before you do anything, it helps to understand the difference between these two approaches. They solve the same problem (getting your calls to the AI) but work differently.

What is call forwarding?

Call forwarding sends incoming calls from your current phone number to another number. Your existing carrier stays the same. Your number stays with your current provider. You are just telling it to route calls somewhere else.

Think of it like mail forwarding at the post office. Your address does not change. The mail just gets redirected.

With call forwarding, you can forward all calls, forward only when you are busy, or forward only after hours. Most carriers support all three options using simple star codes from your phone.

What is number porting?

Number porting is a permanent transfer. Your phone number moves from your old carrier to the new provider. Your old carrier loses control of the number entirely. It now lives with the new service.

This is different from forwarding because the original account is closed or the number is released. Once the port is complete, your old provider is out of the picture.

Which should you choose?

Start with call forwarding. It takes five minutes, changes nothing about your current phone setup, and lets you test the AI phone answering service before committing. If you decide it is not for you, just turn forwarding off and everything goes back to normal.

Port your phone number once you are confident the service works for your business. Porting removes the middleman (your old carrier), can save you money on a monthly phone bill you no longer need, and simplifies your setup to a single provider.

Most business owners start with forwarding and never feel the need to port. Both options keep your number the same. The only difference is where the number technically lives.

How to set up call forwarding to an AI answering service

This is the fastest way to get started. You will need the phone number your AI answering service gives you when you sign up (we will call it your "AI number" below) and your phone.

Forward all calls

This sends every incoming call to your AI answering service, all the time.

AT&T: Dial **21*, then your AI number, then #. Press call and wait for confirmation.

Verizon: Dial *72, then your AI number. Press call and wait for confirmation

T-Mobile: Dial **21*, then your AI number, then #. Press call.

Landline: Dial *72, then your AI number. Wait for the confirmation tone or message.

Forward when unanswered or busy

This lets your phone ring first. If you do not pick up, the call goes to the AI. This is a good option if you want to answer calls yourself during business hours and only send overflow or after-hours calls to the AI.

AT&T: Dial **61*, then the AI number, then # (no answer). Dial **67*, then the AI number, then # (busy).

Verizon: Dial *71, then the AI number (no answer or busy).

T-Mobile: Dial **61*, then the AI number, then # (no answer). Dial **67*, then the AI number, then # (busy).

These codes vary by carrier and phone type. Upfirst has call forwarding guides for every carrier with exact instructions for your provider.

How to port your business phone number to an AI answering service

If you have been using call forwarding and you are ready to make it permanent, porting your phone number is the next step. Here is exactly how it works.

What you need before you start

Gather this information from your current carrier before you request the port:

• Account holder name exactly as it appears on the account

• Account PIN or password (the one you set up when you opened the account, not your online login password)

• Service address on file with the carrier

• A recent bill showing the number you want to port (some providers require this as proof of ownership)

If you do not have your PIN, call your current carrier and ask them to add one or confirm what it is. This is the most common reason ports get rejected. Not every one will have a PIN, but it's important to double check.

The porting process step by step

1. Sign up with your new AI answering service, get your new account set up, and start forwarding your calls from your business line to your agent. With Upfirst, you can do this in a few minutes.

2. Contact the new provider and request a number port. You will need to fill out a Letter of Authorization (LOA), which is a short form giving the new provider permission to transfer your number. Most services handle this digitally.

3. The new provider submits the port request to your old carrier. You do not need to call your old carrier yourself. In fact, do not cancel your old account yet. The port request handles the transfer automatically.

4. Wait for the port to complete. Your old carrier processes the request and releases the number. You will get a notification when it is done.

5. Test the number by calling it from another phone. Make sure calls reach your AI answering service. Check that your greeting plays, your business hours work, and messages are being captured.

6. Confirm your old account is closed. Once the port is complete, your old service should automatically deactivate. Check your next billing cycle to make sure you are not being charged.

How long does porting take?

The timeline depends on what type of number you are porting:

• Cell phone number: 1 to 3 business days

• Landline number: 5 to 10 business days (landline ports involve more paperwork between carriers)

• VoIP number (Google Voice, RingCentral, Grasshopper): 1 to 3 business days

The FCC requires carriers to process port requests promptly. If your old carrier is dragging their feet, you can file a complaint with the FCC. In practice, most ports complete without issues.

What happens to your calls during the port?

This is the question that keeps business owners up at night. Here is the short answer: as long as you set up call forwarding before porting, you will not miss calls.

During the porting window, your calls continue to ring on your old carrier until the port finalizes. There is no gap where calls go nowhere. Once the port completes, calls switch over to the new provider. The cutover happens in the background, usually within minutes.

If you already have call forwarding set up to your AI answering service, calls are covered the entire time. The forwarding keeps working until the port completes, then the number lives directly with the new provider. It is a seamless handoff.

Common issues and how to avoid them

Rejected port requests

The most common reason a port gets rejected is mismatched account information. Your name, address, account number, and PIN all need to match exactly what your old carrier has on file. Double-check everything before submitting.

If the port is rejected, you will get a reason code. Fix the issue and resubmit. It does not mean you cannot port your number. It just means something did not match.

The forwarding loop problem

If you forward your cell phone to the AI answering service and also ask the AI to transfer calls back to that same cell phone, you create a loop. The call bounces back and forth.

The fix: use a second number for transfers. A free Google Voice number works. Forward your main business number to the AI, and have the AI transfer to your Google Voice number when a call needs to reach you directly.

No outbound calling after porting

When you port a phone number to an AI answering service, the number becomes inbound-only. You will not be able to make outgoing calls from it. If you need to call customers back from your business number, keep your old carrier and use call forwarding instead of porting.

This is why most business owners stick with forwarding. They keep their existing phone for outbound calls and let the AI, acting as a virtual receptionist, handle the incoming ones.

Carrier-specific quirks

AT&T landlines can be tricky for conditional forwarding. The star codes sometimes require a pause or a specific sequence. Check the AT&T call forwarding guide for the exact steps.

Some VoIP providers handle forwarding in their online dashboard rather than through star codes. If you use RingCentral, Grasshopper, or Google Voice, look for the forwarding settings in your account rather than dialing from the phone.

FAQ

Can I keep my business phone number when switching to an AI answering service?

Yes. Whether you use call forwarding or number porting, your business phone number stays the same. Customers, leads, and anyone who has your number will still reach you at the same number they have always called.

Is porting my phone number free?

Most AI answering services do not charge a porting fee. Your old carrier is not allowed to charge you for releasing the number either, per FCC regulations. However, you may owe an early termination fee if you are under contract with your current provider.

Do I need to cancel my old phone service before porting?

No. Do not cancel your old service before the port is complete. If you cancel first, you may lose the number entirely. The porting process handles the transfer automatically, and your old account will close once the number moves.

What if I just want to try an AI answering service without porting?

Use call forwarding. It takes five minutes, keeps your current carrier and plan active, and lets you test the service with zero commitment. If you want to learn more about how it all works, read our guide on how an answering service works.

Can I port a Google Voice or VoIP number?

Yes. Google Voice, RingCentral, Grasshopper, and most VoIP providers support number porting. The process is the same, but you will request the port through your VoIP provider's dashboard rather than calling a carrier. VoIP ports typically complete in 1 to 3 business days.