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Number Porting

Number Porting: How It Works

Number Porting

Transferring an eligible existing fax number from another provider into a Fax.Plus account while retaining the same number.

Published on
September 9, 2026
Last updated on
November 3, 2026

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  • 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.
  • Check number eligibility before purchasing a plan. US ported numbers require Premium or higher; requirements in other countries may differ. Keep the current service active until Fax.Plus confirms completion.

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, before purchasing a plan. Fax.Plus checks the active number’s eligibility 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, subscribe to a plan that supports it: US numbers require Premium or higher, while requirements in other countries may differ. A temporary number lets you set up the account while the transfer is pending. Provide a signed Letter of Authorization (LOA) and a recent invoice; the details must match the current provider’s records. Supply a port-out PIN or account number if the provider requires one. Keep the current service active until Fax.Plus confirms that the port is complete; the transferred number then replaces the temporary number.

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.

When a carrier changes a school’s underlying line service, plan the school fax-line cutover and office handover as well as the number transfer. Porting a number does not migrate other equipment using the old line.

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A Common Case: Keeping a Number Clients Already Know

Consider a small law firm in Colorado changing fax providers. It checks the existing number’s eligibility before purchasing a Fax.Plus plan, supplies the required documents and keeps its current service active until transfer is confirmed complete. If the port completes, clients and courts can continue using the same fax number; the firm tests sending and receiving and follows any separate contact-update requirements.

FAQs

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

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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?

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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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