What happens when you transfer your phone number
When you transfer your phone number to a new provider, you keep the same number but switch which company handles your service. The process is called a port or porting. Your old provider stops providing service to that number, and your new provider takes over. The number itself stays the same — your contacts, your voicemail greeting, everything tied to that number moves with you.
Porting usually takes between one and three business days, though it can be faster or slower depending on your old provider and the type of service you're switching from. During the transfer, you may lose service for a few hours or even a full day. Some providers let you keep both services running until the port completes, so you can test the new one before the old one shuts off.
Key Takeaways
- You need your account number and PIN or password from your current provider before you contact the new one — have these ready before you start.
- The new provider handles the port request on your behalf, so you don't contact your old provider directly to authorize the transfer.
- Porting takes one to three business days, and you may lose service briefly during the switch, so plan the timing around when you need your phone.
- Some providers charge a fee to port in, and your old provider may charge an early termination fee if you're still under contract.
- Once the port is complete, your old account closes automatically and you'll be billed by the new provider going forward.
Gather your account information before contacting a new provider
Before you call or visit a new provider, you need two pieces of information from your current account: your account number and your account PIN or password. The account number is usually on your bill or in your provider's app. The PIN is a security code you set up when you opened the account, or one your provider assigned to you.
If you don't have your PIN, call your current provider's customer service line and ask them to reset it or provide it to you. You'll need to verify your identity — usually by providing your Social Security number, date of birth, or the last four digits of the card you use to pay the bill. Write down both the account number and PIN and keep them with you when you contact the new provider.
Start the port through your new provider
Contact your new provider by phone, in person at a store, or through their website. Tell them you want to port your number from your current provider. They will ask for your account number and PIN from your old provider, the phone number you want to transfer, and confirmation of your new service plan.
The new provider submits the port request to your old provider on your behalf. You do not need to contact your old provider or sign anything with them — the new provider handles the authorization. The new provider will give you a confirmation number and tell you when the port should complete. Save this confirmation number in case you need to follow up.
What to expect during the transfer window
Once the port request is submitted, your number is locked at your old provider, meaning they cannot cancel it or transfer it anywhere else. During this time — usually one to three business days — your service may work on both the old and new provider's networks, or you may lose service temporarily. This varies by provider and by whether you're switching from a landline, mobile phone, or internet-based service.
If you're switching mobile providers, keep your old phone turned on during the port so your old provider can complete the handoff. Once the port finishes, your old phone will stop working on the old network, and your new phone (or the same phone on the new network) will start working. If you're switching a landline or VoIP service, the timing depends on your provider's systems.
Costs and contract considerations
Porting your number itself is free — the new provider cannot charge you to receive a port. However, your new provider may charge a one-time set up or setup fee, which is separate from the port. Your old provider may also charge an early termination fee if you're still under a service contract. Check your current bill or contract to see if you have an early termination fee and how much it is.
Some providers waive early termination fees if you port to them, so ask your new provider whether they offer this. If you're switching from a prepaid plan, there's usually no contract and no early termination fee. If you're switching from a postpaid plan (a monthly contract), the fee varies by provider and by how much time is left on your contract.
Confirm the port is complete
After the port window closes, test your new service by making a call, sending a text, and checking that data works if you have a data plan. Your old provider's service should stop working at this point. If your old phone still works on the old network, contact your new provider's customer service and give them your confirmation number — they can check whether the port actually completed.
Once the port is confirmed complete, your old account closes automatically. You will no longer be billed by your old provider. Your new provider will begin billing you on your next billing cycle or on the date you agreed to when you started service. If you were on a prepaid plan, any remaining balance on your old account is usually forfeited, so use it up before you port if possible.
Porting from a business line or landline
Porting a business phone number or a traditional landline works the same way as porting a mobile number, but the process may take longer and require more documentation. Some landline providers require a letter of authorization signed by the account holder before they'll release the number. Your new provider will tell you what documents they need and will usually handle collecting them from you.
If you're porting a number that's tied to a business address or a service like fax, make sure your new provider supports that service before you port. Some providers don't offer fax-over-internet or don't support numbers tied to specific addresses. Confirm this with the new provider before you submit the port request, because once the port is in progress, you cannot easily cancel it.
What to do if the port fails or takes too long
Ports occasionally fail because of a mismatch in account information, a system error, or a dispute between providers. If your port doesn't complete within the expected window, contact your new provider's customer service with your confirmation number. They can check the status and resubmit the request if needed.
If your old provider is disputing the port, your new provider will tell you. This usually happens if there's an unpaid balance on your old account or if the account information doesn't match. Resolve any unpaid balance with your old provider, then ask your new provider to resubmit the port. If the port is still blocked, you may need to contact your old provider directly to authorize the release.
Frequently Asked Questions
Can I port my number if I'm still under contract?
Yes, you can port at any time, even if you're under contract. However, your old provider may charge an early termination fee. Some new providers waive this fee as an incentive to switch, so ask before you port. The fee is separate from the port itself and is charged by your old provider, not the new one.
What if I want to keep my old service running while I test the new one?
Some providers allow you to keep both services active during the port window so you can make sure the new service works before the old one shuts off. Ask your new provider whether they support this before you start the port. If they do, they'll tell you when to switch your phone over to the new network.
Can I port a number that's registered to someone else?
No, you can only port a number if you're the account holder or have written authorization from the account holder. If the number is registered to someone else, that person needs to contact the provider and authorize the port, or you need a signed letter from them giving you permission to port it.
How long does porting take if I'm switching from a VoIP service?
VoIP ports usually take one to three business days, the same as mobile or landline ports. However, some VoIP providers have stricter requirements and may ask for more documentation. The process is the same — your new provider submits the request, and your old provider releases the number once they verify your identity.
What happens to my voicemail and text messages when I port?
Your voicemail greeting and saved messages stay with your old provider and are not transferred. Once your old account closes, you lose access to them. If there are important messages, save them or write down the information before you port. Your new provider sets up a new voicemail box on their system once the port completes.