Switching US Carriers? How to Keep Your Number

2026-10-26

The short version: US number portability lets you take your number to a new carrier. You need three things to line up — your old carrier's account number, a freshly generated transfer PIN, and billing name and address that match the old account exactly. And the golden rule: do not cancel the old line until the port is complete, because an inactive number cannot be ported.

1. Before you start: gather these three items

• Old carrier account number: found on your old bill or in the old carrier's app — not the new carrier's account, and not the phone number itself.
• Transfer PIN: generate a fresh one in the old carrier's app or website right before you port. It expires quickly, so do not reuse an old voicemail PIN from years ago.
• Matching billing name and address: these must match the old carrier's records character for character, including middle names and ZIP code. If you moved recently, check which address the old carrier still has on file.
• Turn off any port-out protection: carriers offer a number lock against unauthorized transfers. It blocks your own port too — switch it off first, then turn it back on with the new carrier.
• Check that your phone is unlocked: a carrier-locked phone will not work on the new network even after a successful port.

2. The steps: start the port with the new carrier

• When signing up or activating with the new carrier, choose "Keep my number" and enter the old account number, transfer PIN, and billing ZIP.
• Keep the old line switched on and able to receive texts while the port runs, and do not submit the request twice.
• Once the port completes, the old line closes automatically. Then insert the new SIM or download the new eSIM and restart the phone.
• Porting itself is usually free, but fees and timing vary by carrier and plan — confirm at the time of purchase.

3. The most common reasons a port fails

• Cancelling the old line first: the number one cause. Once a number is deactivated, it cannot be ported — you would have to take a new number.
• Expired or wrong PIN: a transfer PIN is a short-lived code. If it expired, generate a new one rather than guessing an old password.
• Name or address mismatch: a missing middle name or one wrong ZIP digit is enough for the old carrier to reject the request.
• Unpaid balance: outstanding bills can block a port, so settle them before you start.
• Swapping eSIMs mid-port: finish the port first. Do not delete the old eSIM before the transfer is complete.

4. After the port: a quick checklist

• Voicemail resets on a new carrier — record a new greeting and test it.
• Test a call, a text, and mobile data separately to confirm all three work.
• Sign in once to each service that uses SMS codes — banks, email, social accounts — and confirm codes arrive.
• Re-enable number lock with the new carrier to protect against unauthorized transfers.
• If a port gets stuck, ask the new carrier to check its status first; the new carrier can then confirm the rejection reason with the old one. Do not change details on both sides at random.