Porting Your Number From T-Mobile or Verizon to AT&T

Porting rules are universal; escape routes are not. If you're leaving T-Mobile or Verizon specifically, the difference between a 15-minute port and a rejected one comes down to knowing exactly where each carrier hides its Transfer PIN — and when in your billing cycle to make the jump. We've already published the general guide to switching to AT&T and keeping your number; this article is the carrier-specific companion. Bookmark whichever half applies to you.

Thirty Seconds of Ground Rules

Two universals before the specifics, because they're the ones that cost people their numbers:

1. Never cancel your old service first. A number only ports while it's active. You sign up at AT&T, the port pulls your number over, and the old line closes automatically. The port is the cancellation.
2. Porting needs three matched pieces: your old carrier's account number (not your phone number), a Transfer PIN generated for the purpose, and the account holder's name and billing info exactly as the old carrier has them on file.

Everything below is about where T-Mobile and Verizon each keep those pieces.

Leaving T-Mobile: Where Everything Lives

Your account number is at the top of any T-Mobile bill and in the T-Life app under your account profile. Write it down exactly — a transposed digit is the most common rejection cause we see.

Your Transfer PIN is not your account password and not the 6-digit security PIN you use with customer service. It's a dedicated code T-Mobile generates specifically to authorize a port-out:

• In the T-Life app: log in as the primary account holder, open your profile/account settings, and look for Transfer PIN (sometimes shown as "Request a transfer PIN"). Tap it and the app issues the code on the spot.
• On the web: log in to your T-Mobile account, head to your profile's privacy and security settings, and find the Transfer PIN section.
• By phone: dial 611 from your T-Mobile line and ask for a number transfer PIN. Expect a retention pitch; you're under no obligation to explain yourself.

Two T-Mobile quirks worth knowing. First, only the primary account holder can generate the PIN — if you're a line on a family plan, the account owner has to do this step. Second, the PIN is time-limited (on the order of days, not months), so generate it the same week you plan to switch, not a month ahead.

T-Mobile prepaid lines have an extra wrinkle: the account number isn't printed anywhere obvious. Call T-Mobile prepaid support and ask for your account number and transfer PIN before you come in.

Leaving Verizon: Where Everything Lives

Verizon calls its code a Number Transfer PIN, and it gives you three ways to get one:

• In the My Verizon app: sign in as the account owner or manager, open Account Settings, and select Number Transfer PIN to generate the code.
• On verizon.com: same path from your account settings after signing in.
• The shortcut everyone forgets: dial #PORT from your Verizon phone, and Verizon texts a transfer PIN straight to you. This is usually the fastest route.

Your Verizon account number appears on your bill and in the app's account overview. Like T-Mobile's, the transfer PIN has a limited validity window — treat it as fresh produce and generate it within days of switching.

Verizon-specific notes: the PIN request must come from the account owner or a designated account manager; a plain line user will be refused. And if your account has a past-due balance, Verizon can reject the port until it's cleared — check your balance before you come in.

Timing the Jump: Billing Cycles and Unpaid Phones

The billing-cycle math. Major postpaid carriers, T-Mobile and Verizon included, generally do not prorate your final month — cancel three days into a cycle and you'll typically still be billed for the full month, and service simply runs to the cycle's end. The practical takeaway: switching in the last week of your billing cycle wastes the least money. Look up your cycle date in the app before picking your switch day, but don't cut it so close that your fresh Transfer PIN expires while you wait.

The installment question. Still paying off a phone through T-Mobile or Verizon? Three things happen when you leave:

1. The remaining device balance is still yours — leaving doesn't erase it, and the old carrier typically bills the remainder on your final invoice or accelerates it.
2. Promotional bill credits stop. If your "free" phone was actually 24 or 36 months of monthly credits, the unearned credits vanish when you port out — meaning the free phone retroactively wasn't. Add up remaining credits before deciding; sometimes waiting a few months out is genuinely smarter, and sometimes a switch promotion outweighs what you'd forfeit.
3. The phone stays network-locked until it's paid off. Your number will port regardless, but the handset may refuse a new SIM until the old carrier unlocks it, which they generally won't do with a balance outstanding.

Bring your latest bill to the store and we'll run this math with you before anything is submitted — it takes five minutes and has changed more than a few switch dates.

After the Port: Make Sure the Old Account Actually Closed

The port completing is not the same as the old account being fully wrapped up. A short post-switch checklist:

• Single-line accounts close automatically when the number leaves — but log in once more a few days later and confirm the account shows cancelled.
• Multi-line accounts stay open for the remaining lines. If the whole family moved, verify every line ported and nothing is still billing.
• Expect one final bill covering your last cycle plus any device balance. Autopay usually collects it; if you kill autopay too early you can accidentally create a past-due mark.
• Watch for stray charges one cycle later. A forgotten tablet line, a watch plan, device insurance — these small orphans are the most common source of "why is Verizon still charging me" three months on.
• Keep your last statement until everything zeroes out, in case you need to dispute anything.

What Happens on the AT&T Side

At our San Gabriel headquarters store — an AT&T authorized retailer — the switch itself is the easy part: bring photo ID, your phone, the account number, and that fresh Transfer PIN. We submit the port, pick the right plan for your line count, and activate eSIM or physical SIM on the spot; mobile-to-mobile transfers usually land within 15 minutes to a few hours, and your old SIM keeps working until the moment of handoff. Everything we handle in store is on the wireless services page, and you can book a visit online to skip the line. English and Chinese both spoken, every day.

FAQ

Where exactly is the Transfer PIN in the T-Mobile app? Log in to T-Life as the primary account holder, open your account/profile settings, and look for "Transfer PIN." If you can't find it, dialing 611 and asking works too.

What's the fastest way to get a Verizon Number Transfer PIN? Dial #PORT from your Verizon phone — the PIN arrives by text. The My Verizon app's Account Settings works as well.

Should I wait until my phone is paid off to switch? Not necessarily. Compare what you'd forfeit (remaining promo credits, immediate device balance) against current switch offers. Bring your bill in and we'll calculate both paths before you commit.

My number ported but my old carrier is still billing me. Why? Usually a final non-prorated bill, a leftover line (tablet, watch), or device insurance that didn't auto-cancel. Log in to the old account and check what's still active — then close it explicitly.

Ready When You Are

Generate the PIN this week, note your billing date, and bring both to San Gabriel — or book online first. For the porting rules that apply to every carrier, read the full switching guide.