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TLDR: Where your business phone number sits today decides how you keep it. A number with an outside carrier moves to your own account through phone number porting, and the account holder of record signs that request. A number inside your agency’s HighLevel account moves with your whole sub-account when the agency transfers it between two LC Phone accounts, or alone when HighLevel Support migrates it, and every path needs a close read of your contract before you give notice.
If your business is the carrier’s account holder of record, you sign the port request yourself, and if the number sits in your agency’s HighLevel account, the agency or HighLevel Support moves it, so read your contract before you ask.
You call a number every day. Your customers know it. Your voicemail greeting is on it. If your marketing agency set up your phone line inside its HighLevel account, the agency controls that account. Now you want to leave and keep the number.
Here is my honest read: your phone number is the first business asset to protect when you leave, and your path out starts with one fact, where the number sits today.
Who Controls Your Number? Phone Number Porting Starts With the Account Holder

I read both FCC orders on number portability and HighLevel’s phone number migration and porting guides before writing this, and the timeline you should expect comes from HighLevel’s guides, not from the FCC’s one-business-day rule for simple carrier-to-carrier ports.
The losing carrier checks every port request against its own records. HighLevel’s porting guide says your name and address “must match your carrier records exactly,” and your letter of authorization must be “signed by the authorized person.” If your business opened the carrier account, that person is you. If the agency opened it, the agency holds that signature.
A HighLevel migration guide separates migration from porting. If your agency’s monthly fee covers a phone line it set up in LC Phone, your number sits in a sub-account the agency controls. It leaves one of two ways: the agency transfers the whole sub-account to your account, and the number goes with it when both accounts use LC Phone, or HighLevel Support migrates the number alone to your own LC Phone or Twilio account. Moving a number in from a carrier outside HighLevel is phone number porting, the carrier-to-carrier process the two FCC orders below address. Before you submit anything, ask HighLevel Support which path applies and what authorization it requires, and read your contract’s number-ownership terms.
What Do FCC Porting Rules Require, and How Long Will Your Move Take?

Two FCC orders shape phone number porting. FCC 03-237, a 2003 order on wireless-to-wireless porting, says “the Commission’s number portability rules impose on carriers an obligation to port numbers to other carriers upon receipt of a valid request to do so,” and that “carriers may not refuse to complete a port while attempting to collect fees or settle an account with a customer.” On a wireless port, that protects you when your business is the carrier’s customer, but it erases no debt, and the order does not “sanction or encourage consumers to breach their contractual obligations.”
The second, FCC 10-85 from 2010, carries the rule text: carriers “must complete a simple wireline-to-wireline or simple intermodal port request within one business day unless a longer period is requested by the new provider or by the customer.” Simple ports cover only single-line accounts with no reseller involved, and the clock starts when the old carrier gets a complete request from your new provider.
HighLevel’s guides set out your real timeline:
- Outside-carrier port of fewer than 50 numbers: about two to four weeks after you submit documents
- Larger ports: about six to eight weeks
- Migration: about one to two business days once Support has all required information
- Sub-account transfer: once you approve the agency’s request and nothing blocks it
For an outside-carrier port, you need a letter of authorization signed by the account holder, a carrier bill no more than 90 days old, your service address, and your carrier account details. The losing carrier checks them against its own records, then sets a Firm Order Commitment window, and HighLevel says carriers do not promise exact dates or times.
The A2P Registration Catch: Texting Permissions Differ From Phone Number Porting

Here is the trap: moving the number does not always move your texting registration. If the agency transfers your whole sub-account and both accounts use LC Phone, HighLevel says “Eligible A2P registration stays with the numbers.” If the number moves alone, by migration or phone number porting, your A2P status sits with “the account or sub-account environment rather than only the phone number.”
Twilio’s A2P 10DLC documentation explains the structure. Your brand tells carriers “who is sending these messages.” Your campaign describes “the purpose of your messages,” so list what you send today, such as appointment reminders and two-way texting. Twilio says anyone texting US phones from an application over a 10DLC number “must register for A2P 10DLC.”
For a number moving alone, HighLevel’s own phone move guide says A2P registration “should not be assumed to transfer with the number,” so start or verify registration in your new account before the move and attach the number to your approved campaign before you rely on texting.
Phone Number Porting, Migration or Transfer: The Step-by-Step Order That Avoids Delays

Your move looks simple until one detail stalls it. Follow this order and you avoid the delays HighLevel’s guides warn about:
| Step | Action | Why It Matters |
|---|---|---|
| 1 | Inventory your numbers and identify the account holder | The name on the carrier account, or the HighLevel account holding the number, decides whether you port, migrate, or ask the agency for a sub-account transfer. Get the account holder name, service address, and carrier account number from your last carrier bill. |
| 2 | Create your own HighLevel account and start your A2P brand registration | A number that moves alone needs an approved campaign in your account. Start early so your review is already underway. |
| 3 | Move your number to your new account | Submit your letter of authorization and carrier bill for an outside-carrier port, your destination Location ID or Twilio Account SID for a migration, or your account’s Relationship Number for a sub-account transfer the agency sends. |
| 4 | Attach the number to your approved A2P campaign | Once the number is in your account, attach it to your approved campaign before you rely on texting. |
| 5 | Test inbound and outbound calls and texts | Call the number from another phone. Send yourself a test SMS. Verify routing and automation workflows before you tell customers the number moved. |
| 6 | Give notice under your contract | Once calls and texts test clean, give notice the way your contract requires, and ask the agency to keep the old account active until the move is complete. |
The order matters when your number moves alone. Move it first and register second, and you lose registered texting until your new campaign clears review. Register first, and your review is already underway when the number arrives.
What If Your Agency Will Not Release the Number

Start with your own paperwork. Read your contract for number ownership, port-out rights, fees, and termination terms, and have your own attorney read anything unclear before you sign or approve any request.
Option one is to ask. Request in writing that the agency transfer your sub-account or release your number, and agree on the steps before anyone submits a request.
Option two works only when your business, not the agency, is the account holder on the carrier’s records. Confirm that on a bill from the phone carrier itself, not an agency invoice, because HighLevel asks for the carrier’s bill showing the account owner name. Then submit your port request with your letter of authorization and that bill.
Option three covers a number inside the agency’s HighLevel account. It moves by a Support-coordinated migration or, between two LC Phone accounts, by a sub-account transfer, which by default only the Agency Owner requests or completes. Neither is a carrier port, so the FCC orders above do not describe it. Take any disagreement over the number to your own attorney.
Your Path Forward: Get Your Number Working in Your Own Account First

Aim to have your number working in your own HighLevel account before your agency access ends. Test your workflows and automation, your SMS messaging and call tracking, and your A2P campaign there, then give notice the way your contract requires. See how the move works before you start.
Sign up for your own HighLevel account through our link and we migrate your contacts, pipelines, calendars, automations and funnels into it at no charge. You pay HighLevel directly, from $97 a month. That $97 is the HighLevel list price as of September 15, 2026, and every plan starts with HighLevel’s own 14-day free trial. Porting and A2P re-registration are handled as part of the move. Start your own HighLevel account.
Frequently Asked Questions

Does a carrier refuse to port my number because I owe the agency money?
The FCC rule covers the carrier’s own bills, not your agency’s. In FCC 03-237, a 2003 wireless porting order, the Commission barred carriers from refusing to complete a port while trying to collect fees or settle an account with their own customer. Money you owe your agency is a matter for your agency contract, so read its payment and termination terms first.
How long does it take to port a number?
Plan in weeks for a port and in business days for a migration. HighLevel puts an outside-carrier port of fewer than 50 numbers at about two to four weeks after your documents are in and a migration at about one to two business days, while a sub-account transfer waits on your approval of the agency’s request. The FCC’s one-business-day rule covers only simple wireline and intermodal ports, counted from the old carrier’s receipt of a complete request. If the carrier rejects your request, HighLevel shows the reason in the Port-In Numbers tab or by email, and you submit a corrected new one.
What happens to my old text message history when my number moves?
It depends on the path. A whole sub-account transfer keeps “Conversations and conversation history” with the sub-account, but HighLevel says moving or porting a number alone “does not automatically move contacts, conversation history” or recordings into a new account. If your number moves alone, export any critical history from your agency’s HighLevel account before the move and before the agency removes your access.
Do I have to use HighLevel for my number after I leave my agency?
No. A number already in LC Phone moves to your own Twilio account by a HighLevel Support migration. If you pick a provider outside HighLevel, that provider submits the port request, the account holder of record signs the authorization, and the losing carrier checks it against its own records.
What if the agency says the number is part of their proprietary system?
Check the records before you argue. Ask which carrier account or HighLevel account holds the number and whose name is on it. If your business is the carrier’s account holder of record, you sign the port request yourself. If the number sits in the agency’s HighLevel account, it moves through a Support-coordinated migration or, when both accounts use LC Phone, a sub-account transfer the agency starts, so read your contract’s number-ownership terms and take any disagreement to your own attorney.
Do I port my number while I am still under contract with the agency?
Read your contract first. The carrier checks a port request against its own records, not against your agency contract, and the FCC’s 2003 order says it does not “sanction or encourage consumers to breach their contractual obligations.” Have your own attorney read your termination and number-ownership terms if they are unclear, and if the number sits in the agency’s HighLevel account, talk to the agency and HighLevel Support before you act.
Want your number moved and registered before you give notice?
Sign up for your own HighLevel account through our link and we migrate your contacts, pipelines, calendars, automations and funnels into it at no charge. You pay HighLevel directly, from $97 a month. Porting and A2P re-registration are handled as part of the move.
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