You can keep your phone number when you switch carriers using a process called number porting
When you move to a new carrier, you do not have to get a new phone number. A process called number porting lets you transfer your existing number to the new provider. The old carrier does not own your number — the phone system does — so you have a legal right to take it with you.
The new carrier handles most of the work. You tell them you want to port your number, they contact your old carrier to request the transfer, and your number moves over within one to three business days. During that time your phone may not work for calls or texts, so timing matters if you rely on your number for work or emergencies.
Key Takeaways
- Number porting is free and legal — your phone number belongs to the phone system, not to your carrier, so you can take it anywhere.
- Your new carrier does the porting work for you; you do not contact your old carrier directly.
- The transfer takes one to three business days, during which your phone will not receive calls or texts on that number.
- You need your account number and PIN from your old carrier before you start, so have those ready when you visit the new carrier.
- Some carriers charge an early termination fee if you leave before your contract ends, but that is separate from porting and happens regardless.
What information you need from your old carrier
Before you walk into a new carrier's store or call them, contact your current provider and get two pieces of information: your account number and your account PIN (sometimes called a security PIN or transfer PIN). These are not the same as your SIM PIN, which unlocks your phone.
You can find both by logging into your online account, calling your current carrier's customer service, or visiting a store. Write them down or take a photo — you will need them when you set up service with the new carrier. If you cannot find your PIN, ask the old carrier to reset it or provide a new one; they can do this in minutes.
Also check whether you are under a contract with your current carrier. If you are, leaving early usually triggers an early termination fee. That fee is separate from porting your number — you will owe it regardless — but it is worth knowing the amount before you switch.
How to start the porting process at your new carrier
Visit the new carrier in person, call them, or go through their website. Tell them you want to port your existing number instead of getting a new one. They will ask for your account number and PIN from your old carrier, your name, and your address.
The new carrier will then submit a porting request to your old carrier on your behalf. You do not contact the old carrier yourself — the new one handles the handoff. The new carrier will give you a confirmation number and tell you when to expect the transfer to complete, usually within one to three business days.
During the porting window, your phone will not receive calls or texts on your number. Some carriers give you a temporary number to use in the meantime, but not all do. If your number is critical for work, ask the new carrier whether they offer a loaner number or SIM card during the transfer.
What happens to your old phone service during the transfer
Your old carrier will not cut off your service the moment you request a port. They keep your line active until the new carrier confirms the transfer is complete. This overlap prevents you from losing service entirely, but it also means you may be charged by both carriers for a few days.
Once the port completes, your old carrier will stop billing you and your service with them ends. Check your next bill to make sure you were not charged for a full month after you left. If you were, contact them and ask for a credit for the days after the port completed.
If you had a contract with your old carrier, you still owe any early termination fee even though your number moved. That fee will appear on your final bill or be sent separately. Porting your number does not waive it.
Why the transfer sometimes fails or takes longer
Most ports complete on schedule, but a few things can slow it down. If your account number or PIN is wrong, the old carrier will reject the request and the new carrier will contact you to ask for the correct information. This adds several days to the process.
If you have an outstanding balance with your old carrier, they may refuse to port your number until you pay it. This is rare but does happen. If the port gets rejected, ask the new carrier why — they will have the rejection reason from the old carrier.
Occasionally a carrier's system has a delay or a request gets lost. If your port does not complete within the timeframe the new carrier gave you, contact them and ask for a status update. They can check with the old carrier and resubmit if needed.
Porting between prepaid and postpaid plans
You can port your number whether you are moving from a prepaid plan to postpaid, from postpaid to prepaid, or between two postpaid carriers. The process is the same either way — the new carrier requests the port and your old carrier releases the number.
If you are switching from prepaid to postpaid, make sure you have any remaining balance on your prepaid account spent or transferred before you port. Once the port completes, your prepaid account closes and any unused credit is usually forfeited. Check your prepaid carrier's policy on this before you start.
Switching from postpaid to prepaid works the same way, except you will not have a contract to worry about. Prepaid plans do not lock you in, so you can port your number and leave whenever you want without a termination fee.
What to do if your number cannot be ported
In rare cases, a number cannot be ported. This usually happens if the number is too old, if it was disconnected for a long time before you tried to port it, or if there is a dispute about who owns it. Some very old numbers or numbers from carriers that no longer exist may also be stuck.
If your new carrier tells you the port failed and cannot be completed, ask them to explain why. They should have the specific reason from the old carrier. At that point, you have two choices: get a new number from the new carrier, or contact your old carrier directly to try to resolve the issue.
If the old carrier says the number is locked or disputed, ask them to unlock it or clarify the dispute. This can take a few phone calls, but most issues can be resolved. Once the old carrier confirms the number is portable, the new carrier can resubmit the request.
Frequently Asked Questions
How long does it take to port my number?
Most carriers complete the port within one to three business days. Some carriers finish in 24 hours, while others take the full three days. The new carrier will give you a specific date when you request the port. During this time, your phone will not receive calls or texts on that number.
Do I have to pay to port my number?
No. Number porting is free by law. Your new carrier will not charge you for it, and your old carrier cannot charge you either. If someone tells you there is a porting fee, that is not legitimate.
Can I use my phone while the port is happening?
You can use your phone to make calls and send texts, but only if your new carrier has already activated your service on a temporary number. Once the port completes, your original number will work on the new carrier's network. During the transfer window, calls to your old number will not reach you.
What if I change my mind after I request the port?
You can usually cancel a port request within the first 24 hours by contacting your new carrier. After that, the request has likely been submitted to the old carrier and cannot be stopped. If you cancel early enough, your old carrier keeps your number and your service continues as normal.
Will porting my number affect my phone's ability to work on the new network?
No. Porting only moves your phone number from one carrier to another. It does not change your phone itself or how it connects to the network. As long as your phone is compatible with the new carrier's network, it will work the same way it did before.