To port fax number means to move a fax number the business already owns, on a phone company line, into an online fax service so the same number keeps working with no machine and no line. Number portability is a right in the United States, the phone company cannot refuse a valid request, and the online vendor does the paperwork. What the business has to supply is proof it owns the number and patience while the two carriers exchange the request. This page sets out the steps of porting a fax number, what vendors print for it, and the mistakes that leave an office without fax for a week.
The steps of porting a fax number
Open the online fax account first, on a temporary number, so there is somewhere for the ported number to land. Submit the port request in the vendor's account with the number, the account holder's name and address exactly as the phone company has them, the phone company account number, and a recent bill as proof. The vendor sends the request to the losing carrier, which checks the details and, if they match, releases the number on a date the vendor confirms. On that date inbound faxes start arriving in the online account and the phone line goes quiet. Keep the machine plugged in until the vendor confirms the port has completed, then cancel the line.
What it costs to port a fax number
WestFax prints a $20 one-time fee per number to port an existing fax number, on plans that start at $14.99 a month with 500 pages. Other vendors in the Fax Line Index list porting on their own pages, some included with a plan and some as a fee, and the index records what each prints beside its entry price. The cost that matters more is the phone line: once the number has moved, the business stops paying the phone company for a line whose only job was the fax, and that saving usually exceeds the online plan. The one cost to avoid is cancelling the line before the port completes, which surrenders the number and makes it unrecoverable.
How long it takes, and what to keep running
Porting a fax number typically takes days rather than hours, because the losing carrier verifies the request and the two carriers agree a date; a mismatch in the name or address on the request is the common cause of delay, and the fix is to resubmit with the details exactly as the bill shows them. During the wait the old machine keeps receiving on the old line and the online account receives on its temporary number, so nothing is lost. After the port, the temporary number can be kept as a second line or released. The Federal Communications Commission's guide on keeping your number when changing providers covers the right to port and what a carrier may ask for.
Questions people ask about port fax number
Can any fax number be ported?
A number the business owns on a carrier's line, yes. A number that belonged to a previous online service can also move; a number assigned to someone else's account cannot.
Will I lose faxes during the port?
Not if the old line stays active until the vendor confirms completion. Faxes go to the old machine until the switch date and to the online account after it.
Can I port a toll-free fax number?
Yes; toll-free numbers port between responsible organisations rather than local carriers, and the vendor handles that. Ask the vendor to confirm toll-free porting before ordering.