The fastest way to keep your number when you switch phones

Moving your phone number to a new phone takes between a few minutes and a few days, depending on whether you're switching within the same carrier or moving to a different one. If you stay with your current carrier — Verizon, AT&T, T-Mobile, or a smaller provider — the process is usually automatic: your number transfers the moment you activate the new phone on their network. If you're switching carriers, you'll need to request a port, which is the formal process of moving your number from one company to another. This typically takes 24 hours but can stretch to a week if there are complications with your old account.

The key difference is that staying with your carrier requires almost no action from you, while switching carriers requires you to initiate the port yourself and have specific information ready before you start.

Key Takeaways

  • Switching to a new phone on the same carrier is automatic — your number moves when you activate the new device, usually within minutes.
  • Switching to a different carrier requires you to request a port and provide your account number, PIN, and billing zip code from your old carrier.
  • Keep your old phone and old carrier active until the port completes, because your number won't work on the new carrier until the transfer finishes.
  • Ports usually take 24 hours but can take up to a week; contact your new carrier if it hasn't completed after two business days.
  • You'll lose access to any carrier-specific features like voicemail greetings or call forwarding settings when you port to a new carrier.

Staying with your current carrier

If you're buying a new phone from Verizon, AT&T, T-Mobile, or another carrier and keeping that same carrier, your number transfers automatically. You don't need to do anything except activate the new phone. When you turn on the new device and connect to the carrier's network, your number is already assigned to it.

The activation happens either in-store (if you buy from a carrier location), online (if you order from the carrier's website), or through the carrier's app. During activation, you'll be asked to confirm your account details. Your old phone will stop working on that carrier's network once the new phone is activated, so you won't be able to make calls or send texts from the old device anymore — though it will still connect to Wi-Fi if you want to use it for other purposes.

This process takes minutes to a few hours at most. If you're switching phones on the same carrier, there's no waiting period and no risk of losing your number.

Switching to a different carrier

Porting your number to a new carrier is more involved because you're moving the number from one company's system to another's. You'll start the process with your new carrier, not your old one. When you visit the new carrier's store, website, or call their customer service, tell them you want to port your existing number. They'll ask you for information about your old account so they can request the transfer.

Have these details ready before you contact your new carrier: your phone number, your account number from your old carrier, your account PIN or password, and the billing zip code associated with your old account. If you don't know your account number, log into your old carrier's website or app, or call their customer service to find it. Your PIN is usually a four-digit code you set up when you opened the account; if you've forgotten it, your old carrier can reset it, though this may take a day.

Once you provide this information, your new carrier submits the port request to your old carrier. Your old carrier has 24 hours to approve or deny the request. If approved, the port usually completes within 24 hours but can take up to a week. During this time, your number still belongs to your old carrier — don't cancel your old service yet. Keep your old phone active and your old carrier's service running until you receive confirmation that the port is complete. If you cancel too early, the port may fail and you could lose your number.

What happens during the port

While the port is in progress, your number won't work on either network reliably. You may be able to receive calls and texts on your new phone, but outgoing calls or texts might fail. Some carriers send you a text message when the port completes; others don't. The safest way to confirm the transfer is finished is to make a test call from your new phone after 24 hours have passed. If the call goes through, the port is complete.

Once the port finishes, your old phone will immediately stop working on your old carrier's network. Your new phone will have full service on your new carrier. At this point, you can cancel your old carrier's service if you want, though there's no harm in waiting a few days to make sure everything is working correctly.

Ports that take longer than expected

Most ports complete within 24 hours, but some take longer. Common reasons include a mismatch between the information you provided and what's in your old carrier's system, an unpaid balance on your old account, or a PIN that doesn't match. If your port hasn't completed after two business days, contact your new carrier's customer service and ask for the status. They can see where the request is stuck and what information is missing.

If your old carrier denied the port, your new carrier will tell you why. The most common reason is an incorrect account number or PIN. You can request the port again with the correct information. If your old account has an unpaid balance, you may need to pay it before the port can proceed, depending on your old carrier's policy.

What you'll lose when you port

When you move to a new carrier, you lose access to any features that were specific to your old carrier. This includes custom voicemail greetings, call forwarding rules you set up through the carrier's system, and any carrier-specific apps or services. Your contacts, text messages, photos, and other data on your phone itself will remain — those are stored on the device, not with the carrier.

You'll also lose any discounts or promotional rates you had with your old carrier. Your new carrier may offer different promotions for new customers, but you won't automatically get the same deal you had before. Check what offers your new carrier has for switchers before you complete the port.

Porting from a prepaid or MVNO carrier

If you're switching from a prepaid carrier like Boost Mobile, Cricket, or Metro by T-Mobile, or from an MVNO (a smaller carrier that uses another company's network), the port process is the same. You still need your account number, PIN, and billing zip code. The main difference is that prepaid carriers sometimes have stricter rules about when you can port — some require your account to be active for a certain number of days before you can request a port. Check your carrier's website or call customer service to confirm you're may be able to access.

If you're switching from a regional carrier or a very small MVNO, the port may take longer because the carrier's systems are less automated. Give it up to a week before contacting your new carrier to ask about the delay.

Frequently Asked Questions

Can I use my new phone before the port completes?

Yes. Your new carrier will give you a temporary number to use while the port is in progress. Once the port finishes, your original number replaces the temporary one. You can start using the new phone immediately, but tell people to call or text your original number, not the temporary one, so they reach you after the port is done.

What if I don't know my account PIN?

Call your old carrier's customer service and ask them to reset it. They'll verify your identity by asking for your account number, the phone number associated with the account, and other details. Once reset, you'll receive a new PIN by text or email. This usually takes a few minutes to a few hours.

Can I port my number if I still owe money to my old carrier?

It depends on the carrier. Some carriers allow ports even if you have an unpaid balance; others block the port until you pay. If your port is denied because of an unpaid balance, contact your old carrier to find out what you owe and pay it, then request the port again.

What if my port fails?

If the port fails, your number stays with your old carrier and you keep the temporary number your new carrier gave you. Contact your new carrier's customer service to find out why it failed — usually it's a mismatch in account information. Once you correct the information, you can request the port again.

Do I need to do anything with my old phone after the port completes?

No. Your old phone will simply stop working on your old carrier's network. You can keep it as a backup, sell it, recycle it, or use it on Wi-Fi for other purposes. There's no action required on your end.