Transfer times depend on your carrier and the type of service you're switching from

A phone number transfer, called a port, typically takes between one and seven business days. The exact timeline depends on whether you're moving between wireless carriers, switching from a landline to mobile, or moving a business line. Some carriers complete transfers in 24 hours; others take the full week. The receiving carrier controls the speed, not the carrier you're leaving.

During the transfer window, you may lose service for a few hours to a full day. Most carriers will tell you when to expect the switch. If you're porting a number you've had for years, the process is the same length as porting a number you got last month — age doesn't matter.

Key Takeaways

  • Wireless-to-wireless transfers usually complete within one to three business days, while transfers from landline or VoIP services often take three to seven days.
  • You need your account number and PIN or password from your current carrier before you start, and the receiving carrier will contact your old carrier to initiate the port.
  • Your old service will stop working once the port completes, so arrange the timing so you're not without a phone during the switch.
  • If the port fails or gets rejected, the receiving carrier must tell you why within one business day, and you can try again or contact your state's public utilities commission.

Wireless-to-wireless transfers are the fastest

Moving your number from one cell phone company to another — for example, from Verizon to T-Mobile — usually takes one to three business days. The receiving carrier submits a port request to your old carrier, and the old carrier has up to one business day to accept or reject it. Once accepted, the switch typically happens within 24 hours.

You'll keep your old service active until the port completes. Once your number rings on the new carrier's network, your old account closes automatically. Some carriers charge an early termination fee if you're under contract; others do not. Check your contract or call your current carrier before you start the port.

Landline and VoIP transfers take longer

Porting a number from a traditional landline (through companies like Verizon, AT&T, or CenturyLink) or from a VoIP service (like Vonage or Ooma) to a wireless carrier takes three to seven business days. These services are regulated differently than wireless, and the carriers involved move more slowly. Some landline carriers require written authorization before they'll release a number.

If you're moving a business line, add another two to three days. Business ports require more verification, and some carriers have separate teams that handle them. Ask your new carrier upfront whether they consider your line a business or residential port — the classification affects the timeline.

What you need before you start the port

Contact your current carrier and ask for your account number and the PIN or password associated with your account. The receiving carrier will need both to submit the port request. If you don't have a PIN, call your old carrier and ask them to set one or provide it to you in writing.

You'll also need to know the service address on your current account — the physical location where the service is active, not your mailing address. For business lines, have your business tax ID or EIN ready. The receiving carrier will ask for all of this information when you walk in or call to start the port.

What happens during the transfer window

Once the port request is submitted, your old carrier has one business day to accept or reject it. If they accept, the receiving carrier schedules the actual switch. You'll usually get a text or call telling you when the switch will happen — often a specific window like "between 2 p.m. and 6 p.m. on Thursday."

During that window, your phone may not ring or send texts for a few minutes to a few hours. Some carriers keep your old service running until the new one is confirmed; others cut it off as soon as the port completes. Have a charger nearby and let people know you might be briefly unreachable. If you use your number for two-factor authentication on bank accounts or email, log in before the port starts so you don't get locked out.

Ports that fail or get rejected

A port can be rejected if your account has an unpaid balance, if you're still under contract with an early termination fee, or if there's a dispute about who owns the number. Some carriers reject ports if the account holder's name doesn't match exactly — for example, if your account says "Robert Smith" but you're trying to port as "Bob Smith."

If your port is rejected, your old carrier must tell the receiving carrier why within one business day. The receiving carrier will contact you with the reason. You can then fix the issue (pay the balance, update the name on the account, or resolve the dispute) and submit the port request again. The second attempt usually goes through within the same timeframe as the first.

Porting a number you no longer actively use

If your number has been inactive for more than 60 days, some carriers will not port it. The rules vary by state and by carrier. Call your old carrier and ask whether your number is still portable. If it's been inactive for longer than their window, you may need to reactivate it for a month before you can port it out.

Numbers that have been disconnected for years are sometimes reassigned to new customers. If you're trying to port a number you haven't used in several years, contact your old carrier first to confirm they still have it on file and that it hasn't been reassigned.

Frequently Asked Questions

Can I use my phone while the port is happening?

You can use it until the moment the port completes. Once your number rings on the new carrier's network, your old phone will stop working on the old carrier's service. The receiving carrier will set up your phone on their network, usually within minutes of the port completing. Bring your phone to the store or have it ready at home so you can turn it on with the new carrier's SIM card as soon as they tell you the port is done.

What if I want to keep my old carrier's email or voicemail?

Your phone number ports, but your email and voicemail do not. If your carrier provides an email address tied to your account (like a Verizon or AT&T email), you'll lose access once the port completes. read any messages or files you need before the port starts. Some carriers let you keep the email address as a standalone account after you leave; call and ask.

Do I have to port my number, or can I just get a new one?

You can get a new number instead of porting. The new carrier will assign you a number in your area code within minutes. Porting takes longer but lets you keep the number people already have for you. If you've had the same number for years and use it for work or on important accounts, porting is usually worth the wait.

What if my port takes longer than the carrier said it would?

Contact the receiving carrier and ask for a status update. If it's been more than seven business days and the port still hasn't completed, ask to speak with the porting department. If the carrier can't resolve it, you can file a complaint with your state's public utilities commission, which oversees phone service rules in your state.

Can I cancel the port after I've started it?

Yes, but only before the port actually completes. Once your number rings on the new carrier's network, it's done and you can't undo it. If you change your mind before the switch happens, contact the receiving carrier when ready and ask them to cancel the port request. Your old service will stay active on your original carrier.