How to Move Your Phone Number to a New Phone

What happens when you switch phones

Your phone number stays with your carrier — the company you pay for service, like Verizon, AT&T, T-Mobile, or a smaller provider. When you get a new phone, you do not need to do anything special to keep the same number. The carrier moves your account to the new device automatically, usually within a few hours of set up.

The confusion happens because "switching your number" can mean two different things: moving your existing number to a new phone (which is automatic), or moving your number from one carrier to another (which requires a few steps). This guide covers both, starting with the simpler one.

Key Takeaways

Switching to a new phone on the same carrier happens automatically when you set up the new device — your number moves with no action required from you.
Moving your number to a different carrier requires a transfer authorization code from your current carrier, which takes about 24 hours to arrive.
Your old phone stops working once the number transfers, so back up your contacts, photos, and messages before you start the process.
The new carrier handles most of the transfer work, but you need to have your account number and the last four digits of your Social Security number ready.
If the transfer fails, contact your new carrier when ready — they can troubleshoot or restart the process the same day.

Keeping your number when you upgrade to a new phone

If you are staying with the same carrier and just getting a new phone, the process is nearly automatic. When you buy a new phone from the carrier's store, online, or through a third party, you set up it by either inserting your SIM card (the tiny chip that holds your account information) or scanning a QR code that links the phone to your account.

Within a few hours, your phone number and all your service settings transfer to the new device. Your old phone will stop receiving calls and texts once the transfer completes. You do not need to call anyone or fill out forms — the carrier's system handles it. If you bought the phone from a third party like Best Buy or Amazon, the carrier's website will walk you through set up step by step.

The only time this gets complicated is if you are switching from an iPhone to an Android phone (or vice versa) and you have not backed up your contacts and messages. The number itself transfers fine, but your message history and some contact details may not. Back up to iCloud (for iPhone) or Google Drive (for Android) before you set up the new phone.

Moving your number to a different carrier

Switching carriers is more involved because your current carrier has to release your number, and your new carrier has to request it. The process takes about one to three business days, though it can be faster. You will need three pieces of information: your account number with your current carrier, the last four digits of your Social Security number, and a transfer authorization code (sometimes called a port authorization code or PAC).

Start by contacting your current carrier and asking for the transfer authorization code. You can call their customer service line, visit a store, or request it online through your account portal. Write down the code — it usually expires after 30 days, so do not wait. Some carriers will also ask why you are leaving; you do not have to explain, but they may offer you a discount to stay.

Once you have the code, contact your new carrier and tell them you want to bring your number with you. They will ask for the code, your account number, and your Social Security number. Give them the new phone's details too — the model, color, or IMEI number if they ask. The new carrier then submits a request to your old carrier to transfer the number. This usually takes 24 hours, but can take up to three business days.

What to do while the transfer is happening

During the transfer window, your old phone will still work, but do not rely on it for important calls or texts. Once the transfer completes, your old phone stops receiving service when ready. Back up everything you need before the transfer starts: contacts, photos, messages, app data, and any documents stored on the phone.

If you have not already done so, set up your new phone with the same email account you use for apps and services. This makes it easier to restore your contacts and downloaded apps once the number is active. If you use two-factor authentication (a security code sent to your phone number) for banking, email, or social media, update those accounts to use your new phone number before the transfer, or you may get locked out temporarily.

Your new carrier will text or call you when the transfer is complete. This usually happens overnight or early morning. Once you see that notification, turn off your old phone and turn on the new one. Your number should work when ready.

Troubleshooting a failed or delayed transfer

Sometimes a transfer gets stuck or fails. The most common reasons are a typo in your account number, a mismatch in your Social Security number, or your old carrier flagging the request for review. If your transfer does not complete within three business days, contact your new carrier first — they can see where the request is stuck and resubmit it if needed.

If your old carrier is blocking the transfer, ask them why. Common reasons include an outstanding balance on your account, a contract that requires early termination fees, or a security hold because of suspicious activity. Settle any balance or dispute with your old carrier, then ask your new carrier to resubmit the transfer request. This usually resolves the issue within 24 hours.

If your new phone never receives service after the transfer supposedly completed, restart the phone first. If that does not work, contact your new carrier's customer service line. They can check whether the transfer actually went through and set up your number manually if the system did not catch it.

Keeping your number if you switch between prepaid and postpaid plans

Some people move from a prepaid phone plan (where you pay upfront for service) to a postpaid plan (where you pay a monthly bill), or vice versa. Your number can move either direction, but the process is the same as switching carriers: you need a transfer authorization code from your current provider and you give it to your new provider.

The main difference is timing. Prepaid services sometimes process transfers faster because there are fewer account details to verify. Postpaid carriers may take longer if they need to run a credit check on you. Either way, the transfer should complete within three business days. If you are moving from postpaid to prepaid, make sure your new prepaid plan has enough balance to set up — some carriers require a minimum amount before they will accept a transferred number.

What happens to your old phone after the transfer

Once your number transfers to a new carrier, your old phone becomes a blank device on that carrier's network. It will not receive calls or texts, and it will not have service. You can still use it on Wi-Fi to send messages through apps like WhatsApp or iMessage, but it is no longer connected to your phone number through the carrier.

If you want to reuse the old phone on a different carrier later, you can. It will work fine as long as it is not locked to your old carrier. Most carriers unlock phones automatically after you pay them off or after a certain amount of time. You can also ask your old carrier to unlock it before you switch. Once it is unlocked, any carrier can set up it with a new number or a transferred number.

Frequently Asked Questions

Can I keep my number if I switch from one carrier to another?

Yes. You request a transfer authorization code from your current carrier, give it to your new carrier, and they handle the rest. The transfer takes one to three business days. Your number stays the same throughout the process.

What if I lose my transfer authorization code before I use it?

Request a new one from your current carrier. Codes usually expire after 30 days, so you have time. If yours expired, just ask for another. There is no limit to how many times you can request one.

Will my contacts and messages transfer to my new phone automatically?

Your phone number transfers, but your contacts and messages do not. Back up your old phone to iCloud (iPhone) or Google Drive (Android) before you switch, then restore from that backup on your new phone. This copies everything over.

Can I use my old phone while the transfer is happening?

Yes, but do not rely on it for important calls or texts. Once the transfer completes, your old phone stops receiving service when ready. Back up everything you need before the transfer starts.

What if my new carrier says my transfer failed?

Ask them why. Common reasons are a typo in your account number, a mismatch in your Social Security number, or your old carrier blocking it. Fix the issue with your old carrier if needed, then ask your new carrier to resubmit the request. Most transfers that fail the first time go through on the second try within 24 hours.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.