Porting guides / Cox
How to move your number from Cox
Cox Voice home and business phone lines, and Cox Mobile numbers. You need your Cox account number and port-out PIN.
What you'll need from Cox
- Account number
- On your Cox bill and in your Cox account online or in the Cox app.
- PIN
- Cox Voice: the port-out PIN printed on your Cox bill, which you can also view or change in your Cox account. Cox Mobile: ask Cox Mobile support for a transfer PIN.
- Name and address
- Exactly as Cox has them on your account. Copy them from a recent bill.
- A recent bill
- A PDF or a photo from the last 30 days.
Get your PIN
- Find the port-out PIN on the first page of your Cox bill, or in your Cox account online.
- Can't find it? Call Cox at 800-234-3993 and ask for the account number and port-out PIN. Cox issues one without canceling your service.
- Cox Mobile: call the mobile number in the Customer Information section of your Cox statement.
Good to know
- Keep the Cox line active until the move is done. A canceled number can't be moved.
- Moving the phone number doesn't cancel your internet or TV, but it can change your bundle price.
- Keep your Cox service until the move is done, or the number can be lost.
Then move it to Onyx Phone
- Start your free trial. You get a temporary local number right away, so you can make and take calls today.
- Forward your current number to the temporary one if you like (most landlines: dial *72 and the number), so customers reach you here during the move.
- In Onyx Phone, open Lines, then Begin a port, enter the details above, and attach the bill. Moving a number is free on every plan.
- Sign the letter of authorization we email you. Nothing starts until it's signed.
- The carriers confirm a date, usually 3 to 7 business days after you sign. On port day your number replaces the temporary one, and calls you place show it.
- The temporary number keeps ringing your line for 30 more days, so anyone you gave it to still gets through, then it's released.
Texting registration doesn't come with the number. US carriers approve each business that texts, so register in Onyx Phone when you start the move; approval usually takes one to two weeks, and calling works meanwhile.
Help from Cox
Cox customer support: 800-234-3993.
Questions about moving from Cox
How long does it take to move a number from Cox?
Usually 3 to 7 business days after you sign the letter of authorization. Cox and Onyx Phone's carrier confirm the date, and you get an email at each step.
Will my phone stop working while the number moves?
No. Keep your Cox service until the move is done. You answer on a temporary Onyx Phone number in the meantime, and you can forward your current number to it so customers reach you either way.
Does moving my number cost anything?
Moving it to Onyx Phone is free on every plan.
Can I text from the number as soon as it moves?
Texting registration doesn't come with the number. US carriers approve each business that texts, so register in Onyx Phone when you start the move; approval usually takes one to two weeks, and calling works meanwhile.
What if Cox turns the move down?
Onyx Phone shows what the carrier said, and you can fix the details and send it again. The usual reasons: the account number, name, or address doesn't match what the carrier has. Copy them from a recent bill; the PIN expired or was replaced. Get a new one and send the request again.
Can I move a toll-free number?
Not from the app yet. Guides cover US local and mobile numbers. For a toll-free number, tell us on the contact form and we'll arrange it.
Carriers change their apps and rules; we last checked this guide on October 24, 2026. Markdown version · All porting guides