Number Porting: How It Works

Transferring an existing fax number from another provider into a Fax.Plus account, keeping the same number active throughout.

작성자:

사라 미첼

게시일:

September 9, 2026

최종 업데이트일:

September 11, 2026

Number porting transfers an existing fax number from another provider into a Fax.Plus account, so the number itself doesn't change.
The process typically takes 2 to 4 weeks and requires a Letter of Authorization plus a recent invoice from the current provider as proof of ownership.
A temporary number is assigned to the account while the port is pending, then replaced once the transfer completes.
Porting is available on Fax.Plus's Premium, Business, and Enterprise plans, and only Owners or Admins can submit the request.

What Is Number Porting?

Number porting is the process of transferring an existing fax number from a previous provider into a new account, so the number itself stays the same even though the provider behind it changes.

How Porting Works on Fax.Plus

Requesting a port starts with the Porting Request Form. Fax.Plus reviews the number's portability and typically responds within one business day; see how Fax.Plus number porting works end to end for the full walkthrough. If the number is eligible, the account may need to upgrade to Premium or higher, and a temporary number is assigned while the request is pending. Once approved, the account provides a Letter of Authorization (LOA) and a recent invoice from the current provider as proof of ownership, and the original number transfers in, replacing the temporary one.

How Long It Takes

Porting a number typically takes 2 to 4 weeks, depending mainly on how quickly the current carrier responds to the transfer request.

Once the Number Is Active

Once the port finishes, the number handles transmission like any other Fax.Plus number, appears in the account's job queue and storage, and shows up correctly in the outgoing fax header.

A Common Case: Keeping a Number Clients Already Know

A small law firm in Colorado switching providers ports its existing fax number into Fax.Plus rather than starting over with a new one, so clients and courts that already have that number on file don't need to update anything.

FAQ

How long does it take to port a fax number to Fax.Plus?

Porting a fax number to Fax.Plus typically takes 2 to 4 weeks, depending mainly on how quickly your current provider responds to the transfer request. A temporary number covers your account until the port completes.

What information do I need to port my fax number?

Porting typically requires a completed Letter of Authorization (LOA) and a recent invoice from your current provider as proof of ownership. Some numbers also require upgrading to a higher plan before the port completes.

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