You can switch carriers and keep your phone number, but the process depends on whether you're under contract and which carrier you're moving to

Switching cell phone carriers involves three main steps: checking your current contract status, getting a transfer code from your old carrier, and activating service with your new carrier. Most carriers let you keep your existing phone number through a process called number porting. The whole process usually takes a few hours to a few days, though you may experience a brief gap in service.

The easiest switches happen when your contract has ended or you own your phone outright. If you're still under contract, you may face an early termination fee — typically $200 to $400 depending on how much time remains. Some new carriers will pay this fee as an incentive to switch, so it's worth asking before you decide the fee is a dealbreaker.

Key Takeaways

  • You can keep your phone number when switching carriers by requesting a transfer code from your current provider before you leave.
  • Early termination fees apply only if you're still under contract; month-to-month plans have no penalty for switching.
  • Your phone may not work on the new carrier's network if it was locked to your old carrier, so check compatibility before you switch.
  • The switch typically takes one to three business days, and you should keep your old account active until the new carrier confirms the transfer is complete.

Check your contract status and early termination fees

Log into your current carrier's account online or call customer service to find out whether you're under contract. If you signed up for a subsidized phone deal, you're likely locked in for two years from the activation date. If you've been with the carrier for longer than that, or if you switched to a month-to-month plan, you have no contract and no fee.

If you are under contract, ask what the early termination fee would be. This fee covers the discount the carrier gave you on your phone at purchase. Some carriers, like T-Mobile and Verizon, offer programs where they'll pay off your remaining balance if you switch to them, so compare what you'd owe against what the new carrier will cover.

Confirm your phone will work on the new network

Different carriers use different network technology, and not every phone works on every network. Check the new carrier's website for a list of compatible phones, or call their customer service with your phone's model number. If your phone is incompatible, you'll need to buy a new one — either outright or on a payment plan through the new carrier.

Your current phone may also be locked to your old carrier's network, meaning it won't accept a SIM card from another carrier even if it's technically compatible. Most carriers will unlock your phone for free once your contract ends or if you ask. Call your current carrier and request an unlock; they usually process it within 24 hours. You'll need the unlock code to activate your phone on the new network.

Request your number transfer code before you switch

Contact your current carrier and ask for a number transfer authorization code, also called a port authorization code or PIN. This is a temporary code that proves you own the number and have permission to move it. The carrier will give you the code immediately, either over the phone or through your online account. Write it down — you'll need it when you activate service with the new carrier.

You do not need to cancel your old account before requesting the code. In fact, it's better to keep it active until the new carrier confirms the transfer is complete. If something goes wrong during the switch, your old account will still be active and you won't lose service.

Activate service with your new carrier

Visit a store, call the new carrier, or go to their website to start a new account. Tell them you want to port your existing number. You'll need to provide the transfer code you got from your old carrier, plus your account information from the old carrier (usually your account number and the phone number itself). The new carrier will submit the port request on your behalf.

If you're buying a new phone from the new carrier, you can do this all at once — activate service, port your number, and get the new phone in a single transaction. If you're bringing your own phone, the new carrier will send you a SIM card or give you one in-store. Insert it into your phone, and the activation process will begin.

Wait for the transfer to complete and monitor both accounts

The number port usually completes within one to three business days. During this time, calls and texts may go to either your old or new carrier unpredictably — this is normal. Keep both accounts active until you receive confirmation from the new carrier that the port is complete. You'll typically get a text or email confirming the transfer.

Once the port is confirmed, your old carrier will automatically close your account and stop charging you. If you were on a contract with the old carrier and switched early, the early termination fee will appear on your final bill. Check your old carrier's website a few days after the port completes to make sure the account shows as closed and to review any final charges.

What to do if your phone doesn't work after switching

If your phone doesn't connect to the new network after the SIM card is inserted, restart the phone first. If that doesn't work, go to Settings and check that airplane mode is off. Some phones require you to manually select the new carrier's network from a list of available networks — look for a "Network Selection" or "Carrier Selection" option in Settings.

If the phone still doesn't work, contact the new carrier's customer service. They can check whether the SIM card is activated and whether your phone is compatible with their network. If your phone is incompatible, you'll need to buy a new one. If the SIM card isn't activated, they can reactivate it or send you a replacement.

Frequently Asked Questions

Can I keep my phone number when I switch carriers?

Yes. Request a number transfer code from your current carrier before you switch, then provide that code to the new carrier when you activate service. The process is called number porting and usually takes one to three business days. You'll need to keep your old account active during the transfer.

What happens if I switch carriers while I'm under contract?

You'll owe an early termination fee to your old carrier, typically $200 to $400 depending on how much time is left on your contract. Some new carriers will pay this fee as an incentive to switch. Ask the new carrier whether they offer this before you decide to leave.

Do I need to buy a new phone when I switch carriers?

Not necessarily. If your current phone is compatible with the new carrier's network and is unlocked, you can bring it with you. Check the new carrier's website for a compatibility list, and request an unlock from your current carrier if needed. If your phone isn't compatible, you'll need to buy a new one.

How long does it take to switch carriers?

The number port usually takes one to three business days. You can activate service with the new carrier immediately, but your old number won't be fully transferred until the port completes. During this time, calls may go to either carrier unpredictably.

What if my number doesn't transfer to the new carrier?

Contact the new carrier's customer service immediately. They can check the status of the port request and troubleshoot why it hasn't completed. Common issues include a wrong transfer code or a mismatch between your account information. The new carrier can usually resolve this within a few hours.