The fastest way to keep your number is to let your carrier move it for you

Your phone number stays with your carrier, not with your phone. When you switch iPhones, you do not need to transfer the number itself — it moves automatically when you set up the new phone with the same carrier account. If you are staying with the same carrier and using the same SIM card or eSIM, your number will be there when you power on the new iPhone.

The only time you need to actively transfer a number is when you are switching to a different carrier. That process is called porting, and your new carrier handles most of it. You will need your account number and PIN from your old carrier, but the new carrier's staff can walk you through the rest by phone or in person at a store.

If you are moving to a new iPhone with the same carrier, skip to the section on transferring your data instead. The number transfer happens on its own.

Key Takeaways

  • Your phone number belongs to your carrier, so it moves automatically when you set up a new iPhone on the same account.
  • Switching carriers requires porting, which the new carrier initiates — you provide your old account number and PIN, and they handle the rest.
  • Porting usually takes one to three business days, and your old phone will stop working once the port is complete.
  • Moving your contacts, photos, and other data to the new iPhone happens separately through iCloud, a computer backup, or direct transfer.
  • Keep your old phone powered on until the port is finished, because you may need to answer a verification call from the new carrier.

Staying with the same carrier: what happens automatically

When you buy a new iPhone from your current carrier or bring an unlocked phone to them, the number transfer is built into the setup. During the initial setup on your new phone, you will sign in with your Apple ID and choose to restore from an iCloud backup or set up as new. At that point, your carrier's system recognizes the phone and activates your number on it.

If you are using a physical SIM card, your carrier may give you a new one to insert into the new iPhone. If you are using an eSIM (a digital SIM stored on the phone), the carrier can activate it over the air — you do not need a physical card at all. Either way, your number is live on the new phone within minutes to a few hours.

The only thing you need to do is make sure you are signing into the same carrier account on the new phone. If you have a family plan, sign in with the account holder's details. Your number will appear in the Phone app once activation is complete.

Switching carriers: how porting works and what you need

Porting is the formal term for moving your number to a new carrier. You start by contacting the new carrier — by phone, in a store, or online — and telling them you want to bring your number with you. They will ask for three pieces of information from your old carrier: your account number, your PIN (or password), and sometimes your account holder's name and service address.

You can find your account number and PIN on your old carrier's bill or in their mobile app. If you do not have the PIN, call your old carrier's customer service and ask them to provide it or reset it. Some carriers call this a "port PIN" or "transfer PIN" — it is different from your voicemail PIN.

Once you give the new carrier this information, they file a port request with your old carrier. The process usually takes one to three business days. During this time, your old phone will still work. When the port is complete, your number will ring on the new iPhone, and your old phone will lose service.

What to do while the port is in progress

After you submit a port request, keep your old phone powered on and with you. The new carrier may call or text you to verify the request, especially if there is any mismatch in the information. If you miss this verification, the port can be delayed or rejected.

Do not cancel your old carrier's service during the port. Let it complete first. Once your number rings on the new iPhone, you can contact the old carrier to close the account. Some carriers will charge an early termination fee if you cancel before the port is done, so wait for confirmation that the number has moved.

If the port fails or is rejected, the new carrier will tell you why — usually because the account information did not match or the old carrier flagged a problem. You can resubmit the request with corrected information, or contact your old carrier to resolve the issue before trying again.

Moving your contacts, photos, and other data

Transferring your number and transferring your data are two separate things. Your number moves through your carrier; your photos, contacts, messages, and apps move through iCloud, a computer backup, or direct phone-to-phone transfer.

The easiest method is iCloud. If you were already using iCloud on your old iPhone, your data is already backed up. When you set up the new iPhone and sign in with the same Apple ID, you can choose to restore from that backup. Everything — contacts, photos, messages, app data — will appear on the new phone within a few hours, depending on how much data you have.

If you do not use iCloud, you can connect your old iPhone to a computer, create an encrypted backup in Finder (Mac) or iTunes (Windows), then restore that backup to the new iPhone. This method takes longer but works just as well.

You can also use the direct transfer method: turn on the new iPhone next to the old one, and iOS will offer to transfer data directly between them. This is fast and does not require a computer or iCloud subscription.

Troubleshooting common problems

If your number does not appear on the new iPhone after setup, restart the phone first. If that does not work, go to Settings > General > About and check that your carrier information has updated. If it still shows the old carrier, contact your new carrier's customer service — the activation may not have completed.

If you are porting and the old carrier says your account is locked or flagged, ask them why. Some carriers lock accounts if there is an unpaid balance or a dispute. You may need to resolve that before the port can go through. If the old carrier is refusing to port without a good reason, you can file a complaint with the Federal Communications Commission (FCC), which oversees carrier porting rules.

If you switched carriers but your old voicemail is still playing on the new phone, the voicemail system has not updated yet. This usually clears within 24 hours. If it persists, contact the new carrier and ask them to reset your voicemail.

Frequently Asked Questions

Do I lose my number when I switch iPhones?

No. Your number stays with your carrier's account. When you set up the new iPhone on the same account, your number moves to it automatically. You only lose the number if you cancel the carrier account or port to a different carrier and something goes wrong.

How long does it take to port my number to a new carrier?

Porting usually takes one to three business days. Some carriers complete it faster, but three days is the standard. Keep your old phone on during this time in case the new carrier needs to verify the request.

Can I use my old iPhone while the port is happening?

Yes, until the port completes. Once your number rings on the new iPhone, the old phone will lose service. After that, you can still use it on Wi-Fi, but it will not make or receive calls or texts.

What if I do not know my PIN from my old carrier?

Call your old carrier's customer service and ask them to provide it or reset it. Have your account number and the phone number you want to port ready. They will verify your identity and give you a new PIN.

Will my contacts and photos move to the new iPhone automatically?

Only if you restore from an iCloud backup or a computer backup. Your number moves automatically, but your data does not. Use iCloud, Finder, or direct phone-to-phone transfer to move contacts, photos, messages, and apps to the new iPhone.