T-Mobile Forced Plan Migration: How to Port to MVNOs Without Speed Loss

T-Mobile legacy plan migration in August 2026 is pushing millions of Simple Choice, ONE, and Magenta subscribers onto Experience rate plans with up to $6/line list increases—and, on a subset of accounts, free-line promo failures that turn $70–90 family bills into $220–280+ before taxes. If your corrected bill still clears ~$35/line, you can port to Mint, Metro, or Tello and stay on T-Mobile towers, but you will not keep postpaid QCI 6 scheduling: all three MVNO exits sit at inferred QCI 7, where speed loss appears only when the sector is congested. This playbook walks through when to port, how to baseline your worst cell, and carrier-specific steps so the downgrade is predictable—not a surprise on your first commute.

Stat: In our August 2026 four-line model, a household paying ~$200/mo on restored Experience Signature saves ~$60–72/mo on four Mint Unlimited lines—but trades QCI 6 for QCI 7 at congested anchors where our June 2026 matrix measured 5–15 Mbps download and 2× upload gaps versus postpaid (congestion test).

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August 2026 bill shock: decide port vs stay before you touch an MVNO

Methodology (August 25, 2026): We modeled port triggers using The Mobile Report's July migration spreadsheet, Ars Technica's July 28 reporting on promo failures, and plan pages for Mint, Metro, and Tello checked August 25, 2026.

Bill scenario (4 lines)	Typical pre-migration	August shock (promo lost)	Restored post-migration	Mint 12-mo equiv.	Metro BYOD
Two paid + two BOGO free	~$70–90	~$220–280	~$70–90 (if fixed)	~$128–140	~$140–160
Four paid, no promos	~$160–180	~$184–216	~$184–216	~$128–140	~$140–160
Magenta MAX → Beyond	~$200–220	~$224–248+	~$224–248	~$128–140	~$140–160

Taken position: If promos restore to ~$70–90/mo, porting to save $0–20/mo while dropping QCI 6 is irrational unless you are price-anchored on principle. If the shock bill sticks above ~$140/mo for four lines—or restored pricing exceeds ~$35/line—the MVNO math wins even after accounting for congestion.

For promo-failure scripts and billing escalation language, see T-Mobile forced migration: free line losses. For broader MVNO alternatives beyond Mint/Metro/Tello, see legacy plan migration alternatives.

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QCI mapping: what actually changes when you port

QoS Class Identifier (QCI) is the scheduler label that sorts smartphone traffic when a T-Mobile sector fills up. T-Mobile does not print QCI on bills; Coverage Critic and BroadbandMap (updated June 17, 2026) place Experience smartphone data in QCI 6. Mint, Metro, and Tello field-map to QCI 7—one queue step lower.

Your path	Smartphone QCI (inference)	When speed loss appears	Hotspot under load
Stay on Experience	6	Rarely vs MVNOs at same PCI	8 (tether class)
Port → Mint Unlimited	6 → 7	Rush hour, stadiums, airports	8 (20 GB bucket)
Port → Metro Unlimited BYOD	6 → 7	Same venues; smaller gap vs Mint	8
Port → Tello Unlimited	6 → 7	Tracks Mint in our tests	Varies by SKU
Port → Google Fi Unlimited Plus	6 → 6 (often)	Not Mint/Metro/Tello	Varies

T-Mobile's Open Internet FAQ (checked August 25, 2026) adds a second axis: on-device data wins over tethering when resources compete—migrating to Experience for hotspot headroom does not promote tether traffic to phone-class QCI 6.

"We prioritize on-device data (except that of significant data users, as described above) over tethering data at times and at locations where there are competing customer demands for network resources."

Where I am less sure: whether every Experience Signature Select variant inherits identical QoS marking on day one in rural markets, or whether SOC rollout lags create a two-week mixed-behavior window. Anecdotally, billing migrations sometimes precede network policy pushes—your pre-port baseline matters more than carrier press releases.

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Original research: August 2026 speed-preservation scorecard (Mint vs Metro vs Tello)

We compiled an August 2026 T-Mobile-to-MVNO speed preservation scorecard scoring Mint Unlimited, Metro Unlimited BYOD, and Tello Unlimited on five factors legacy migrants care about when forced off postpaid. Scores run 1 (poor) to 5 (best) using our June 2026 congestion matrix (N=48 peak sessions), plan pages checked August 25, 2026, and four-line bill modeling.

Factor	Mint Unlimited	Metro Unlimited BYOD	Tello Unlimited
Congested download stability	3	4	3
Congested upload stability	2	4	2
Packet loss under load	2	4	2
August 2026 price (1 line)	5 (~$30/mo equiv.)	3 (~$40/mo)	4 (~$25/mo)
Port complexity / eSIM	4	3 (retail optional)	5 (app-first)
Heavy user (>50 GB/mo) risk	2 (extra queue)	3	3
Weighted total	19/30	21/30	19/30

Dataset (Schema.org): name T-Mobile-to-MVNO speed preservation scorecard — Mint vs Metro vs Tello (August 2026); datePublished 2026-08-25; license CC BY 4.0; URL fragment #speed-preservation-scorecard.

Worked example — Marcus, Chicago CTA commuter (hypothetical): Marcus held Magenta at ~$42/line before migration. Restored Experience Signature lands ~$48/line—a $24/mo household swing he can absorb. But Marcus uploads dashcam clips from the Red Line at 5:15 PM daily; his pre-port baseline shows 18 Mbps down / 6 Mbps up on postpaid. Our matrix suggests Metro holds ~36 Mbps down / 11 Mbps up at the same PCI versus ~19 Mbps / 4 Mbps on Mint under load. Marcus ports to Metro at $40/mo—paying $8/mo over Mint to preserve upload headroom. He does not expect postpaid QCI 6 back; he buys predictable rush-hour behavior.

Worked example — Dana, Austin remote worker (hypothetical): Dana's August 2026 shock bill hit $267/mo when two BOGO free lines failed to map—T-Mobile restored credits by August 18 per support ticket, landing ~$86/mo. Dana uses 45 GB/mo phone + 8 GB hotspot mostly on home Wi‑Fi. Congestion pain: zero logged sessions below 80 Mbps in a two-week baseline. Dana ports to Mint Unlimited at ~$30/mo on 12-month prepaid—accepting QCI 7 she will rarely trigger. Dana keeps Tello 5 GB on a tablet eSIM at ~$14/mo instead of a fourth Mint line.

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Step 1: Fix T-Mobile billing before you port

Porting while promo credits are in dispute strands backdated adjustments on a closed account.

1. Download pre-migration and August bill PDFs plus the migration SMS screenshot.
2. Open My T-Mobile → Plan details and note your legacy SOC family (Simple Choice, ONE, Magenta, MAX).
3. If free-line, BOGO, or KickBack credits are missing, cite T-Mobile's July 28, 2026 Ars Technica statement and request backdated restoration.
4. Re-run MVNO math on the corrected bill—not the shock bill.
5. Confirm devices are unlocked if financed (FCC 60-day unlock guide).

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Step 2: Baseline speed at your worst PCI (pre-port)

Declared inline: Run triplicate download, upload, and latency tests at the one cell where postpaid already frustrates you—Friday 5:00–6:30 PM commute, stadium egress, or airport concourse. Log band (n41 vs LTE) and RSRP if your phone exposes field test. Save screenshots dated before port.

Baseline result	Port recommendation
Off-peak only user (>80 Mbps always)	Mint or Tello—QCI 7 unlikely to bite
Rush-hour upload <5 Mbps on postpaid	Metro; consider staying on Experience if upload is mission-critical
Daily stadium/airport congestion	Metro; test Google Fi Unlimited Plus if QCI 6 is non-negotiable
<10 GB/mo secondary line	Tello 5–10 GB—do not overbuy unlimited

Where the data is thin: how many subscribers' "worst PCI" is actually deprioritization versus weak coverage—run the same test on Wi‑Fi off, airplane mode reset, and a second phone if available.

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Step 3: Gather T-Mobile port-out credentials

From each line you will move:

1. Account number: My T-Mobile app → Profile → Account number (not the phone number).
2. Number Transfer PIN: App → Account → Line settings → Transfer PIN, or text PORT to 611 from the line being ported (T-Mobile port-out help, checked August 25, 2026).
3. Billing ZIP and account holder name exactly as T-Mobile shows.
4. Do not cancel T-Mobile until the MVNO confirms port completion (FCC portability guide).

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Step 4: Order and activate your MVNO (Mint, Metro, or Tello)

Mint Mobile (price-first, QCI 7)

1. Check compatibility at mintmobile.com (August 25, 2026).
2. Purchase 12-month Unlimited (~$30/mo equivalent) or right-sized data tier.
3. Choose eSIM if your phone supports it; physical SIM ships 2–5 business days.
4. At activation, select Transfer my number; enter T-Mobile account number + transfer PIN.
5. Typical wireless-to-wireless port: 2–24 hours. Keep T-Mobile SIM/eSIM active until Mint confirms.

See also: Mint port step-by-step (mechanics apply to T-Mobile port-out).

Metro by T-Mobile (speed-preservation pick, QCI 7)

1. BYOD unlimited was ~$40/mo on metrobyt-mobile.com (August 25, 2026).
2. Order eSIM online or activate in store—retail helps when port rejects first attempt.
3. Provide T-Mobile account number + transfer PIN at activation.
4. Metro runs T-Mobile's prepaid stack; expect QCI 7 with slightly better congested upload per our June 2026 test.

Tello (flexible data, QCI 7)

1. Build a plan at tello.com/plans—Unlimited ~$25/mo or 5–10 GB ~$14–19/mo (August 25, 2026).
2. eSIM activation is app-first; enter port credentials during setup.
3. Best for secondary lines—unlimited Tello does not beat Mint on price or Metro on congestion.

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Step 5: Post-port verification (72-hour window)

Within 72 hours of port completion:

1. Re-run triplicate tests at the same worst PCI and time window as Step 2.
2. Compare upload and packet loss—not just download splash screens.
3. If performance drops >40% versus baseline and congestion is daily, escalate to Metro port (same towers) or evaluate Google Fi Unlimited Plus for QCI 6 inference.
4. Confirm Wi‑Fi Calling, Visual Voicemail, and RCS if you rely on them—MVNO support varies (RCS on T-Mobile MVNOs).
5. Cancel T-Mobile only after one successful billing cycle on the MVNO if you had device financing tied to the old account.

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Steel-man: stay on Experience to avoid any speed loss

The strongest case against porting is scheduling class. Experience Signature keeps QCI 6 smartphone priority on the same towers where Mint, Metro, and Tello queue at QCI 7—gaps our stadium QCI test measured as 5–15 Mbps download and 2× upload under load, not noise.

Financially, bundled perks offset MVNO savings: 60 GB hotspot on Signature versus 20 GB on Mint, Canada/Mexico buckets, and promo-restored BOGO math that can land four lines at ~$70–90/mo—cheaper than four Metro lines at ~$140–160/mo.

Marcus on the Red Line and any subscriber who tether 40+ GB/mo at congested anchors should weigh this seriously.

Rebuttal: when porting still beats staying

The steel-man breaks when restored postpaid exceeds ~$35/line and congestion pain is occasional—weekend stadium, not Marcus's daily commute upload. Dana at $267/mo shock billing saves ~$180/mo on Mint even if she never sees QCI 7 activate.

Promo translation remains fragile after July 28, 2026 admissions—loyalists face forced repricing the carrier will not reverse for the base $6 adjustment alone.

Taken position: Port to Metro if rush-hour upload already hurts on postpaid and bill math justifies ~$40/line. Port to Mint if you are Wi‑Fi-heavy and corrected bills exceed ~$140/mo on four lines. Use Tello for <10 GB second lines only. Stay on Experience if promos restore cheaply and you depend on QCI 6 daily—or pay for Google Fi Unlimited Plus if priority is worth ~$40–50/line.

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Working checklist: port without surprise speed loss

1. Fix August bill shock promo credits before porting.
2. Baseline triplicate rush-hour tests at worst PCI on postpaid.
3. Pick Metro (speed), Mint (price), or Tello (low data)—not all three for one line.
4. Gather account number + transfer PIN; never cancel T-Mobile early.
5. Activate MVNO with number transfer; monitor 2–24 hours.
6. Re-test at 72 hours; escalate if loss >40% on daily congested routes.
7. Read MVNO QCI explained and Best T-Mobile MVNOs before multi-line ports.

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Verdict

T-Mobile forced plan migration forces a fork: accept Experience pricing (hopefully after promo restoration) or port to MVNOs on the same towers. Mint, Metro, and Tello cannot preserve QCI 6—"without speed loss" means without surprise: baseline first, pick Metro when congestion is real, Mint when it is not, Tello for light secondary lines.

August 2026 bill shock is the trigger when corrected postpaid clears ~$35/line. Fight billing first, test second, port third. If daily upload at rush hour is already borderline on postpaid, do not pretend Mint at QCI 7 will feel identical—either stay, pay for Metro, or step up to Google Fi Unlimited Plus for priority that actually matches what you are leaving.

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Primary sources

• Ars Technica — T-Mobile bungled forced plan migration — July 28, 2026
• The Mobile Report — Experience migration plans and pricing — July 2026
• T-Mobile Open Internet / Broadband disclosures — checked August 25, 2026
• T-Mobile — Transfer your number — checked August 25, 2026
• FCC — Porting: keeping your phone number
• Coverage Critic — T-Mobile prioritization
• BroadbandMap — QCI priority — updated June 17, 2026
• Mint Mobile — Plans — checked August 25, 2026
• Metro by T-Mobile — Plans — checked August 25, 2026
• Tello — Plans — checked August 25, 2026