The fastest way to keep your number when you switch iPhones

Your phone number moves with you through a process called number porting, which your carrier handles. You do not need to do anything technical on the iPhone itself — the carrier moves the number to your new device's SIM card or eSIM before you even turn it on. The whole process takes a few hours to a few days depending on your carrier and whether you are switching carriers at the same time.

If you are staying with the same carrier (Verizon, AT&T, T-Mobile, or another provider), the number transfer happens automatically when you activate your new iPhone. If you are switching carriers, you will need to request a port from your new carrier, which takes longer but is still straightforward.

Key Takeaways

  • Your carrier moves your number to your new iPhone automatically if you stay with the same provider — you just activate the new phone.
  • If you are switching carriers, contact your new carrier and ask them to port your number; they will handle the request with your old carrier.
  • You will need your account number and PIN from your current carrier to authorize a port to a new provider.
  • Keep your old phone on and connected to service until the port is complete, which usually takes 24 hours but can take up to a week.
  • Your contacts and photos transfer separately through iCloud or a local backup — your phone number is a different process.

Staying with your current carrier

When you buy a new iPhone from your carrier's store or online, the number transfer happens as part of activation. The carrier's staff or activation system will ask which phone number you want on the new device, and they will move it from your old phone's SIM card to the new one (or to an eSIM if your carrier uses that).

If you buy an unlocked iPhone from Apple or another retailer, you still keep your number — you just activate it through your carrier's website or by calling them. Have your account number ready. The carrier will deactivate your old phone and activate the new one on the same number within a few hours.

During this time, you may lose service for 15 minutes to an hour while the switch completes. This is normal. Once the new phone shows service bars and you can send a text, the transfer is done.

Switching to a new carrier and keeping your number

If you are moving to a different carrier, contact the new carrier first — not your old one. Tell them you want to port your existing number. They will ask for your account number and account PIN from your current carrier. If you do not know your PIN, call your current carrier and ask for it (they will verify your identity first).

The new carrier will submit a port request to your old carrier on your behalf. Your old carrier has to approve it within one business day. Once approved, the port usually completes within 24 hours, though it can take up to a week depending on the carriers involved.

Do not cancel your old carrier's service until the port is complete and you have confirmed your number works on the new iPhone. If you cancel early, the port may fail and you could lose the number temporarily.

What to do before you activate the new iPhone

Back up your old iPhone through iCloud or a computer. This saves your contacts, photos, messages, and app data — not your phone number, which is separate. When you turn on the new iPhone, you can restore from this backup and everything will be there except the number, which your carrier is handling independently.

Write down your account number and PIN from your current carrier before you start. If you are porting to a new carrier, you will need these. Your account number is usually on your bill or in your carrier's app. Your PIN is a security code you set up when you opened the account (or the carrier can reset it and send it to you).

If you are trading in your old phone, do not erase it until the port is completely finished and you have confirmed service on the new phone. The old phone needs to stay active during the transfer.

Troubleshooting a number that does not transfer

If your new iPhone shows no service or a different number after activation, contact your carrier immediately. This is usually a delay in the system updating, not a failed port. Most carriers can push the activation through manually within an hour.

If you are porting to a new carrier and the port fails, the new carrier will tell you why — often because the account number or PIN was incorrect, or because your old carrier flagged a billing issue on the account. Fix the problem and resubmit the port request. You can port again at any time.

If you lose service entirely and cannot reach your carrier by phone, try going to a physical store location. They can check the status of your port and sometimes complete it on the spot.

Moving your contacts and data separately

Your phone number is not the same as your contacts or data. Even if the number transfer is delayed, you can still restore your contacts from iCloud or a backup. When you set up the new iPhone, you will be asked whether to restore from a backup — choose yes, and everything except the number will move over.

If you did not back up your old phone, you can still retrieve contacts through iCloud.com if you have an Apple ID. Sign in, go to Contacts, and download them as a file, then import that file to your new phone.

Frequently Asked Questions

Can I use my new iPhone before the number transfer is complete?

Yes. You can set it up, restore your data, and use Wi-Fi immediately. You just will not have cellular service or your number until the carrier finishes the port. Once service appears, everything works normally.

What if my old carrier says I owe money — will that stop the port?

It can. Some carriers will not port a number if there is an unpaid balance. Contact your old carrier, pay what you owe, and then resubmit the port request to your new carrier. The port should go through within 24 hours after payment.

Do I need to do anything on the iPhone to transfer my number?

No. The iPhone itself does not transfer the number — your carrier does. You just activate the phone and the carrier handles the rest. There is no setting or app you need to use.

Can I port my number back to my old carrier if I change my mind?

Yes, you can port to any carrier at any time. Contact the carrier you want to switch back to, provide your account number and PIN, and they will submit the port request. The process is the same as porting to a new carrier the first time.

How long can I keep my old phone after the number transfers?

Once the port is complete and your new iPhone has service, your old phone is no longer active on that number. You can keep it as a backup device, use it on Wi-Fi, or erase it and sell it. The number will not work on it anymore.