How to Switch Cell Phone Carriers and Keep Your Number

The whole trick to keeping your cell number fits in one sentence: sign up with the new carrier first and let it pull the number over while your old line is still active. Don't call the old carrier to cancel. Once the transfer is complete, the old account disconnects on its own.

Cancel too early and you've created extra work. A disconnected line has to be reactivated before the new carrier can move the number. Behind the scenes, the new carrier contacts the old one, transfers the number and shuts off the old line. The FCC's name for this is number portability: keeping your existing number at the same location when you change carriers, without losing quality, reliability or convenience.

Can your number move?

Usually. Verizon describes Local Number Portability as a government mandate that requires mobile and landline providers to let customers keep eligible numbers when they switch. The word "eligible" matters: a number can be turned down because of geography, service area coverage, technology or who owns the line. Ask the new carrier to run its eligibility check before you buy anything.

Your area code doesn't settle the question on its own. Area codes belong to the North American Numbering Plan, and our list of US area codes shows where each one was assigned, but only the portability check tells you whether a port will go through.

Moving a landline or a VoIP number? That's covered in our guide to porting a landline or VoIP number. In short, FCC rules require a simple wireline-to-wireline or simple intermodal port to be done within one business day unless you or the new provider ask for longer, and "intermodal" includes a landline number moving to a cell phone.

What to have in hand before you order

Three items, and they're easy to confuse:

• Your old account number. It's printed on your billing statement, which you can usually pull up in the carrier's app or website. It's not your phone number.
• A number transfer PIN. Your current carrier issues it to authorize the switch. The new carrier can't generate it for you.
• Number lock turned off. Carriers offer a lock that blocks ports; at Verizon it's called Number Lock, and it has to be off before a number can move.

Pay attention to the transfer PIN. It isn't the 4- or 6-digit PIN you type when you call customer service. If the new carrier's form asks for a "port-out PIN," your usual account PIN is the wrong code to type there.

Each carrier issues the transfer PIN its own way. At Verizon, you can dial #PORT from the phone that holds the number and get a link to create one, and on a standard monthly account only the Account Owner or an Account Manager can do it. On a Verizon family plan, that means a line user who isn't the owner or a manager can't request it alone. Verizon's PIN also expires after 7 days, so request it on the day you're ready to activate, not a week ahead.

Give the account number and PIN to the new carrier and nobody else. While you're at it, set a PIN or password on the new account too; the FTC recommends it to help block unauthorized changes.

Porting doesn't unlock your phone

Moving the number and freeing the phone are two separate jobs. If you're keeping your current phone, the old carrier has to lift its software lock, and even then the phone may not work fully on the new network. The CTIA Consumer Code puts it plainly: unlocking does not make a device technologically compatible with another network, and an unlocked phone may get voice service without data.

Carriers that follow the code unlock postpaid phones on request once the service contract or device financing plan is fulfilled, or the early termination fee is paid. Prepaid phones get unlocked on request no later than one year after activation. Within two business days of a request, those carriers commit to unlock an eligible phone, start the process with the manufacturer, or explain why it doesn't qualify.

Verizon, for example, unlocks postpaid phones on its own when they're bought at full retail price or the financing balance is paid off, while its prepaid phones stay locked until 365 days of paid, active service.

On an iPhone, go to Settings, then General, then About. If you see "No SIM restrictions" next to Carrier Lock, you're clear. If not, only your carrier can unlock it, and that can take a few days. Apple can't do it for you. Ask for the unlock before you ask for the transfer PIN.

eSIM or physical SIM on the new line

The new carrier will either send a physical SIM or set up an eSIM. On an iPhone that's already set up, you contact the carrier for a QR code to add the eSIM. Coming from an Android phone to an iPhone, Apple says to contact the carrier, which moves the number by eSIM Carrier Activation or a QR code.

Once the eSIM is active, make a test call. If the new plan replaces one that lived on a physical SIM, pop the old SIM out and restart the phone. More on how eSIM works: how eSIM works on a US phone.

How long it takes, and what works in between

Verizon quotes 4 to 24 business hours for a mobile number. Your old service keeps working during that window. The new line can place calls but won't receive them until the switch is final. So if you're expecting a call from a doctor or a job interviewer, start the switch after it, not before, and keep the old SIM handy until the new carrier confirms completion.

The bills that follow you out the door

Porting ends the line, not every obligation on the old account. Verizon's port-out FAQ is a good checklist of what to look for with any carrier:

• An early termination fee if the line still has an unfinished minimum contract term.
• The remaining device payment balance, which has to be paid off.
• Promotional discounts tied to a term: leaving early voids the deal, and Verizon claws back the discounts, up to a rolling 6 months' worth.
• Smartwatch, tablet or hotspot lines, which you must cancel yourself if you move your last phone line.

If the new postpaid service turns out to be spotty at your house, carriers that follow the CTIA code give new postpaid customers a trial period of at least 14 days to cancel without an early termination fee, as long as you follow the return policy. Test coverage at home and at work during that window. If you travel, it's also worth checking how the new plan handles using your US phone abroad before your next trip.

FAQ

Can I keep my phone number if I switch carriers?

Yes, as long as the number is eligible. Ineligibility usually comes down to geography, coverage, technology or line ownership.

Where do I get a number transfer PIN?

From your current carrier. The new carrier doesn't provide it.

Should I cancel my old service before switching?

No. Leave it active. It disconnects automatically once the number has moved.

Is the transfer PIN the same as my account PIN?

No. The account PIN is the 4- or 6-digit code you already use, and the transfer PIN is a separate code created for the port.

Sources

1. Verizon Support: Bring your number to Verizon FAQs (accessed 2026-09-24)
2. Verizon Support: Move your mobile number to another carrier FAQs (accessed 2026-09-24)
3. Electronic Code of Federal Regulations (FCC rules): 47 CFR 52.21 - Definitions (accessed 2026-09-24)
4. Electronic Code of Federal Regulations (FCC rules): 47 CFR 52.35 - Porting Intervals (accessed 2026-09-24)
5. Federal Trade Commission (Consumer Advice): SIM Swap Scams: How to Protect Yourself (accessed 2026-09-24)
6. CTIA: Consumer Code for Wireless Service (2020) (accessed 2026-09-24)
7. Verizon Support: Device Unlocking Policy (accessed 2026-09-24)
8. Apple Support: How to unlock your iPhone for use with a different carrier (accessed 2026-09-24)
9. Apple Support: Set up eSIM on iPhone (accessed 2026-09-24)