How to switch from T-Mobile and save — the complete guide

A single T-Mobile postpaid line typically runs $60–$100 a month. Mint Mobile, Metro, US Mobile, Google Fi, Ultra Mobile and Tello all sell service on the same T-Mobile towers for $25–$49 — every plan quoted here is in our finder at the same price. Move a typical $65 T-Mobile line to Mint's $30 unlimited plan and you keep $35 a month — $420 a year. Move it to US Mobile at $25 and it's $480 a year. Same number, same phone, same coverage map. Here's how to do it without a hitch — including the one T-Mobile setting that silently blocks ports.

Why switching off T-Mobile saves money

T-Mobile's postpaid price buys more than network access: store support, phone financing deals, bundled perks like Netflix, and top data priority. The cheaper carriers above rent the same network and skip those extras, which is why the service feels identical in most places most of the time. The honest trade-offs: the very cheapest tiers can be deprioritized in a packed stadium, support is app/chat-first, and bundled perks end when your T-Mobile account closes. But run the perk math — switchers routinely save enough to pay for their own streaming subscriptions and still keep $300+ a year. Our finder flags the premium-data switch plans (like US Mobile Premium) if priority data matters to you.

Step 1 — Check your phone is unlocked and compatible

• Is it paid off? T-Mobile phones bought on an Equipment Installment Plan (EIP) stay locked until the balance is zero. Check your remaining balance in the T-Life app — and know that whatever is left comes due on your final bill when you leave.
• T-Mobile's unlock rules. A postpaid device is eligible once it's paid in full and has been active on T-Mobile's network for at least 40 days. Eligible devices typically unlock automatically within about two business days; you can check your line's unlock status in the T-Life app. On iPhone, confirm it yourself: Settings → General → About → Carrier Lock should say "No SIM restrictions."
• Compatibility. Dial *#06# for your IMEI and run it through your new carrier's free checker. Most iPhone 11+ and Galaxy S20+ models work across all three networks — and since Mint, Metro, US Mobile (on T-Mobile), Fi, Ultra and Tello all use T-Mobile towers anyway, a T-Mobile phone is natively compatible with every pick below.

Step 2 — Pick your cheaper plan (all on T-Mobile towers)

These are the T-Mobile-network plans from our catalog, at finder prices:

Want the pick made for you? Enter your T-Mobile bill in the plan finder — it matches plans to your lines and data use and applies family pricing automatically.

Step 3 — Turn off Port Out Protection, then get your Transfer PIN

This is where T-Mobile switches go wrong. If Port Out Protection is switched on for your line, your port will be rejected as "account frozen" no matter how correct everything else is. Turn it off first, in the same place you get your PIN:

1. Open the T-Life app → Manage → tap the gear icon → Permissions & controls.
2. Turn Port Out Protection OFF for the line you're moving.
3. In the same section, tap Transfer PIN → Create PIN. (You can also dial #PORT# from the T-Mobile phone.)

Good to know: only the Primary Account Holder can generate a Transfer PIN; generating one works best on the T-Mobile network with Wi-Fi off. The PIN is a temporary 6-digit code, valid for about 7 days — different from your everyday account PIN, so don't hand your new carrier the wrong one. You'll also need your 9-digit account number, shown on your bill and in the T-Life Manage tab. And as always: do not cancel your T-Mobile line first — the port closes it automatically, and cancelling first loses your number.

Step 4 — Activate and port

1. Order your new plan online and choose "transfer my number."
2. Enter your T-Mobile account number and Transfer PIN exactly as shown on your account — name and billing ZIP must match too.
3. Activate the eSIM or insert the new SIM, but keep your T-Mobile service active until the phone shows the new carrier's name.
4. Ports typically complete in 10–30 minutes. Test with Wi-Fi off: call, text, and load a page on data.
5. Your T-Mobile line closes automatically when the port lands; a final bill follows.

No data or no picture messages after the switch? It's almost always the APN — copy your new carrier's APN settings here, restart, and you're back.

Timing it right

• Port a few days before your cycle ends. Leaving on day 2 of a billing cycle wastes most of a month you've paid for; the last few days of the cycle are the sweet spot.
• Mind the ~7-day PIN window. Create the Transfer PIN when your new plan is ordered and you're ready to activate — and remember Port Out Protection must be off before the PIN will work.
• Remaining EIP balance comes due at once on your final bill, and any monthly bill credits from a "free phone" promo stop the day you leave. If a new carrier offers a payoff promo, save your final T-Mobile bill to claim it.
• Perks end with the account. Bundled streaming and other postpaid perks stop when the last line ports out — line up your own subscriptions so there's no gap, and cost them into the comparison (you'll usually still be well ahead).
• Home Internet and watch lines are separate. T-Mobile Home Internet bills independently and doesn't port with your phone number — cancel or keep it on its own terms.

Pitfalls to avoid

• Port Out Protection left on — the #1 T-Mobile-specific port rejection. Off first, then PIN.
• Cancelling T-Mobile before the port completes — you lose the number, permanently.
• Using your account PIN instead of the Transfer PIN — they're different codes; the port will reject the wrong one.
• Asking anyone but the Primary Account Holder to get the PIN — T-Mobile won't issue it to other lines on the account.
• Leaving mid-EIP without expecting the payoff bill — and assuming promo credits follow you. They don't.
• Porting the week of a trip — give yourself one unhurried hour at home on Wi-Fi.