Your phone number transfers through your carrier, not your phone itself

Your phone number lives with your carrier — Verizon, AT&T, T-Mobile, or whoever you pay each month — not in the phone hardware. When you switch phones, you contact your carrier to move the number to the new device. The process takes a few hours to a few days and costs nothing if you stay with the same carrier. If you are switching carriers, the process is called a port and takes longer but works the same way.

You do not need to back up your number or export it anywhere. You just need your account information and the new phone's details. The carrier handles the rest on their end.

Key Takeaways

  • Contact your current carrier with your account number and the new phone's IMEI or IMSI number to transfer your number to a new device on the same network.
  • If you are switching carriers, you need a porting authorization code from your old carrier before the new one can take over your number.
  • Keep your old phone powered on and connected to service until the transfer completes, usually 24 to 72 hours later.
  • The transfer is free when staying with the same carrier; some carriers charge $25 to $50 to port from another company.
  • Your contacts, photos, and messages do not transfer with your number — back those up separately through cloud storage or a manual export.

Transferring your number to a new phone on the same carrier

Call your carrier's customer service line or visit a store in person. Have your account number ready — you can find it on your bill or in the carrier's app. Tell them you have a new phone and want to transfer your number to it.

They will ask for the new phone's IMEI (International Mobile Equipment Identity), a 15-digit code unique to that device. Find it by going to Settings > About Phone > IMEI, or by dialing *#06# on the new phone. Some carriers also accept the IMSI number from the SIM card, which you can find in Settings > About Phone > SIM Status.

The carrier will set up the number on the new phone's SIM card or eSIM (an electronic SIM that lives in software rather than a physical card). This usually takes a few hours but can take up to 72 hours. You will get a confirmation text or email when it is done. Keep your old phone on and connected to service during this time — turning it off can slow the process.

Porting your number to a different carrier

If you are moving to a new carrier, the process is longer but follows the same principle. Start by contacting your new carrier and telling them you want to bring your number with you. They will ask for a porting authorization code from your old carrier — sometimes called a PIN or transfer code.

Call your old carrier and ask for this code. They may ask why you are leaving, but they must give it to you. Write it down exactly as they say it. Then give it to the new carrier along with your account number and the new phone's IMEI.

The port usually takes 24 hours but can take up to 10 business days. During this time, calls and texts may go to either phone unpredictably. Once the port completes, your old carrier will deactivate your number and you will lose service on that SIM card. Your new carrier will send you a confirmation.

What happens to your contacts, messages, and photos

Your phone number transfer does not move any of your data. Contacts, text messages, photos, and app data stay on the old phone unless you back them up separately. Before you switch phones, export or sync these items to cloud storage or your computer.

On Android, go to Settings > Accounts and turn on sync for Google, Samsung Cloud, or another service you use. On iPhone, turn on iCloud sync in Settings > [Your Name] > iCloud. You can also export contacts as a file: on Android, open Contacts > Menu > Settings > Export, and on iPhone, use a third-party app like My Contacts Backup.

Once you have backed up your data, sign into the same accounts on your new phone and your data will sync over. This is separate from the number transfer and happens through your accounts, not your carrier.

Troubleshooting a transfer that is taking too long

If your number has not transferred after 72 hours on the same carrier, or 10 business days when porting, contact your carrier again. Ask for the ticket number of your transfer request and ask them to check the status. Sometimes transfers stall because of a typo in the IMEI or a mismatch between your account and the new phone.

If you are porting and the new carrier says your old carrier is blocking the transfer, ask your old carrier directly whether they have flagged your account. Some carriers do this if you have an outstanding balance or a contract dispute. Settling the issue with your old carrier usually unblocks the port.

If the transfer fails entirely, the carrier will usually try again automatically or offer to do it manually over the phone. Ask them to walk you through the process step by step and confirm each piece of information before they submit it.

Keeping your old phone working while the transfer happens

Leave your old phone powered on and connected to WiFi or cellular service until the transfer is complete. If you turn it off, the carrier's system may not be able to confirm the transfer on the old SIM card, which can delay the process by hours or days.

You do not need to use the old phone — just keep it on. Once the transfer is done and you have confirmed your number works on the new phone, you can power off the old one, remove the SIM card, or factory reset it.

Switching to a new phone number instead

If your old number is tied to spam calls, fraud, or accounts you no longer use, you can ask your carrier for a new number instead of transferring. This is free and takes minutes. You will lose the old number permanently, so make sure you have notified your contacts and updated any accounts that use it — banks, employers, two-factor authentication apps, and so on.

A new number is sometimes easier than porting if you are switching carriers and your old carrier is being difficult. You get a fresh start, but you will need to update your number everywhere it is registered.

Frequently Asked Questions

Do I need to keep my old SIM card?

No. Once the transfer is complete and your number works on the new phone, you can remove the old SIM card or destroy it. The number lives with your carrier's account now, not the card itself.

What if I have a contract with my old carrier?

You can port your number out even if you have a contract, but your old carrier may charge an early termination fee. This is separate from the port itself. Ask them about the fee before you start the port so you know what to expect.

Can I transfer my number to a phone on a different network type, like from 4G to 5G?

Yes. Your number transfers to any phone on your carrier's network, regardless of which generation of service it uses. The carrier will set up it on whatever SIM or eSIM the new phone has.

How long does a port take if I am switching from a prepaid to a postpaid plan?

Usually 24 to 72 hours, the same as any other port. Prepaid and postpaid are both run by the same carriers, so the process is identical. You will need the porting authorization code from your prepaid account.

What if my new phone does not have a SIM card slot?

Modern phones without SIM slots use eSIM, a digital SIM that lives in software. The carrier activates your number on the eSIM the same way they would on a physical SIM. You do not need to do anything different — just give them the phone's IMEI and they will handle it.