This guide covers the general number porting process. Steps vary by carrier — please check with your provider for full details before initiating a transfer. SwitchNinja is not responsible for any service interruption or charges that may result. See our Terms of Use.
The #1 mistake: canceling your old plan first.
Never cancel your current service before completing the switch. If your number isn't active, it can't be ported. Your old account cancels automatically once the transfer is complete.
Before you start: two things you need
1. Your account number. This is different from your phone number. Find it on your monthly bill, in your carrier's app under "Account," or by calling customer service. Takes 2 minutes to locate.
2. Your account PIN or transfer PIN. This is a 4–6 digit code used to authorize number transfers. If you don't know yours, log in to your carrier's website or app and look for "Transfer PIN" or "Number Transfer PIN" in account settings. Some carriers (like T-Mobile) let you generate a one-time transfer PIN in the app.
🔑 Timing tip
Don't request your Transfer PIN until you're ready to sign up with the new carrier right now. AT&T and Verizon PINs typically expire in 4–6 days. If it expires before you complete the switch, you'll have to generate a new one and start over.
The 5-step process
Step 1
Check that your phone is unlocked
A locked phone only works on one carrier's network. Most phones sold in the past 3 years are unlocked by default. To check: go to Settings → General → About (iPhone) or Settings → Connections → More connection settings → Network unlock (Android). If it's locked, contact your current carrier — they're legally required to unlock it once your device is paid off.
Step 2
Collect your account number and PIN from your current carrier
Log into your current carrier's app or website. Find "Account number" (on your bill) and "Transfer PIN" or "Number transfer PIN" in your account settings. Write both down — you'll need them in step 4. Do NOT cancel anything yet.
One more thing: While you're in the app, check for a "Port Out Protection," "Number Lock," or "SIM Protection" toggle and make sure it's turned OFF. If this is enabled when you try to switch, the port will fail even if your PIN is correct. You can re-enable it on your new carrier after the transfer completes.
Step 3
Sign up with your new carrier
Go to the new carrier's website or app and start the signup process. When asked "Are you bringing your number?" select Yes. Most carriers will order a SIM card at this step (free with most MVNOs) or let you download an eSIM instantly to your phone.
Step 4
Enter your account number and PIN
The new carrier will ask for your current account number, your current carrier's name, your account PIN/transfer PIN, and your billing zip code. Enter these exactly as they appear on your account. This is the step where most errors happen — double-check the account number character by character.
ZIP code tip: Use the billing ZIP code on file with your current carrier — not your home address if you've moved recently. A mismatched ZIP is the #1 reason ports fail.
Step 5
Wait for the port to complete
For most MVNOs and prepaid carriers, porting takes anywhere from a few minutes to a few hours. During this time your old number still works on the old carrier. Once the port completes, you'll get a text or notification from your new carrier — activate the SIM and you're done. Your old account closes automatically.
Watch for these before switching
Early termination fees (ETFs). If you're on a postpaid contract, check whether you owe an ETF for leaving before it ends. Most carriers eliminated ETFs years ago, but device payment plans are different — you still owe the remaining balance on your phone even after switching.
Trade-in credit clawback. If your current carrier gave you trade-in credit paid out monthly, switching will stop those credits. You may owe the remaining balance. Check your current agreement before you leave.
Billing cycle timing. Prepaid carriers don't prorate refunds. If you switch mid-cycle, you lose the unused days. Timing your switch near the end of your billing cycle saves a few dollars.
⚡ The Bottom Line
Switching is easier than most people think — and fear of losing your number isn't a reason to stay.
The process takes 10–30 minutes, costs nothing, and is legally protected. The only things that actually cost money are leftover device payment balances and trade-in clawbacks — both avoidable with a quick check of your current agreement before you leave.
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