How to keep your old phone number before you cancel

A number you've had for years is worth protecting. The good news: you almost never have to lose it. The catch: you have to act while the line is still active, not after you've hung up on it.

Last reviewed: July 2026

People switch carriers, move overseas, consolidate two lines into one, or drop a work phone all the time — and in the rush, they let a number they actually cared about lapse. Once a cancelled number finishes its aging period and gets handed to someone else, it is effectively gone for good. So the single most important thing to understand is this: keeping a number is something you arrange before you cancel anything. There is no reliable "undo" afterward.

You have two broad options for holding onto a number: move it to a new carrier (porting), or park it somewhere cheap that keeps it alive without a full phone plan. Which one fits depends on whether you'll still use the number day to day or just want to preserve it.

Option 1: Port the number to your new carrier

Porting is the process of carrying your existing number from one carrier to another. In the United States, your right to port is backed by FCC rules — carriers generally cannot hold your number hostage, and they can't refuse to release it just because you owe a device balance (that debt still has to be paid, but it's handled separately from the number). Porting is how the vast majority of people keep their number when they change providers.

The golden rule of porting: never cancel first

This trips up more people than anything else. To port a number, it has to still be active with your old carrier. The correct order is to sign up with the new carrier and request the port while your old line is still working. The new carrier coordinates the transfer behind the scenes, and your old account is closed automatically once the number moves. If you cancel the old line yourself first, you may lose the number and the ability to port it.

What you'll need to port

Requirements vary by carrier, but you'll typically be asked for the number you're transferring, your old account number, and a transfer PIN or port-out passcode from the old carrier (many carriers now require this PIN as an anti-fraud measure, so look it up in your account settings or ask before you start). The billing name and address on the old account usually need to match what you give the new carrier. Getting these details exactly right is what prevents a port from stalling.

Number ports are often quick — sometimes under an hour for a single mobile line — but they can take longer if account details don't match or the number is a landline. Don't schedule your port for a moment when being briefly unreachable would be a disaster.

Option 2: Park the number on Google Voice or a similar service

What if you don't want to keep paying a carrier, but you still want the number to exist — to forward calls, to stay reachable, or just to keep it out of the reassignment pool? You can park it. Google Voice, for example, lets you port a mobile number in for a small one-time fee, after which you can receive calls and texts to it over the internet without any monthly carrier plan. Other providers offer similar "keep my number alive" parking services.

Parking is a good fit when a number has sentimental or practical value but isn't your main line anymore — an old business number, a number contacts still have, or a number tied to accounts you haven't finished migrating. The same timing rule applies: the number must be active to port it into the parking service.

Before you pull the trigger: a quick checklist

Decide the number's fate first. Keep it (port or park) or let it go — but choose before you contact anyone about cancelling.
Gather your details. Old account number, the exact billing name and address, and your port-out PIN or transfer passcode.
Start the port from the new side. Let the new carrier or parking service pull the number over while the old line still works.
Confirm the number is live on the new service before closing anything. Only then is the old account safe to consider done.
Handle your security before or right after. Whether you keep the number or not, audit any accounts that use it for login codes — see our guide on unlinking 2FA from a number you're giving up.

If you're not keeping it

Letting a number go is perfectly fine — most numbers don't need to be preserved. Just remember that once you cancel, that number enters an aging period and is eventually reassigned to a stranger. If you want to understand that timeline, see how long until a number gets reassigned, and if you're worried about what the next owner might inherit, read about the problems that come with a recycled number.

This page is general consumer information, not advice specific to your carrier or account. Porting rules, required PINs, parking fees, and timelines vary by provider and change over time — confirm the exact steps with your old and new carriers before you cancel anything.