Your number has been yours for years. Switching carriers doesn't change that.

It's on your bank account, your kid's school forms, the dentist's reminder texts, and the two-factor codes for everything you log into. It's the number your mom still calls first. So when you decide to switch carriers, "will I lose my number?" is usually the first worry.

You won't. In the U.S., you can take your number with you when you switch, as long as your old line is still active when the transfer happens. It's called porting, and it's simpler than it sounds.

Don't cancel your old plan first

This is the mistake that actually costs people their number. If you call your old carrier and cancel, the number can be released, and getting it back isn't guaranteed.

Instead, start service with your new carrier and ask them to transfer your number. Once the transfer finishes, your old line closes on its own. On a family or shared plan, only the line you're moving closes. Everyone else stays put.

What you'll need before you switch

Gather these first and the rest goes quickly:

• Your account number with your current carrier. It's usually on your bill or in the carrier's app, and it's not the same as your phone number.
• A transfer PIN, sometimes called a port-out or number transfer PIN. More on that below.
• The name and billing address on the account, exactly as your current carrier has them. A mismatch is one of the most common reasons a transfer stalls.
• The number you're moving. Yes, really. Typos happen.

How to get your transfer PIN

Most major carriers now require a separate PIN before your number can leave. It's there to stop someone else from moving your number to their own phone.

You can usually get one in your carrier's app or online account, or by calling customer service. A few things to know:

• It can expire, sometimes within a few days, so get it close to when you switch.
• It's different from your account PIN or voicemail password.
• Treat it like a password. Share it only with the carrier you're switching to.

Check your phone before you switch

Your number and your phone are two separate things. Before you move, check two details about the phone itself:

• Is it unlocked? A phone locked to your old carrier won't work on a new network until it's unlocked. Ask your carrier or check your phone's settings.
• Do you still owe on it? If you're paying the phone off monthly, the remaining balance usually comes due when you leave. It typically won't stop your number from moving, but better to know before the final bill shows up.

While you're at it, back up your photos and contacts, and save any voicemails you want to keep. Voicemails usually live with your old carrier, not on your phone.

How long the switch takes

Moving a mobile number between carriers often wraps up within a few hours. Moving a landline or home phone number can take a few business days.

While it's in progress, you might have service on one phone and not the other for a bit. That's normal. Once it's done, calls and texts land on your new line, and your two-factor codes keep arriving like nothing happened. As far as everyone else can tell, nothing did.

Bringing your number to Ting Mobile

If Ting Mobile is where you're headed, your number comes with you. Have the details above ready when you sign up, and we'll request the transfer from your old carrier.

Your number has followed you through new apartments, new jobs, maybe a new city or two. A new carrier is just one more move. Take it with you.