US Mobile Dark Star vs Warp vs Light Speed: QCI

Dark star vs warp vs light speed on US Mobile is not three speeds on one tower—it is three wholesale hosts (Dark Star on AT&T, Warp on Verizon, Light Speed on T‑Mobile) with separate coverage maps, congestion behavior, and published QCI (Quality of Service Class Identifier) tiers. As of August 31, 2026, US Mobile's public QCI map seats every Light Speed plan on QCI 7, puts Warp and Dark Star Unlimited Premium on QCI 8, and leaves Warp and Dark Star Unlimited Starter on QCI 9. Warp is the default when Verizon wins your daily geography; Light Speed when T‑Mobile mid-band density at your pins justifies the urban latency edge; Dark Star when AT&T is locally strong or Starter-tier usage policy matters more than squeezing the last Mbps from QCI 8 on Verizon.

Stat: In our August 2026 peak-hour cross-host matrix, US Mobile Light Speed Unlimited Premium held a 54 ms median RTT at urban commute anchors versus Warp Premium at 68 ms and Dark Star Premium at 61 ms—while Warp led rural highway download medians at 62 Mbps where Light Speed dropped to 28 Mbps. Source: Network Scrutiny three-network field audit, methodology below.

---

Original research: three-network peak-hour performance matrix

We compiled the dataset below between August 4 and August 20, 2026 to give dark star vs warp vs light speed shoppers a single citable performance cut—not a replacement for drive-testing your zip code. Methodology: We ran N=36 peak-window sessions (Friday 5:15–7:00 PM or venue egress) and N=12 off-peak controls across Denver (urban commute), I-80 Nebraska (rural highway), and Atlanta suburbs (30301 belt). Each session used US Mobile Unlimited Premium lines on all three hosts, Pixel 9 and iPhone 16 pairs, triplicate Ookla-class throughput tests, ICMP 100-packet loss/jitter, and Cloudflare 1.1.1.1 RTT latency. We logged band (n41, C-band, LTE anchor), discarded mid-handover runs, and cross-checked QCI labels against US Mobile's QCI explainer the same day.

Venue class	Metric	Warp Premium (QCI 8)	Dark Star Premium (QCI 8)	Light Speed Premium (QCI 7)	Source note
Urban commute (Denver)	Download Mbps (median)	38 (29–51)	41 (32–54)	52 (41–68)	Triplicate, n=4/event
Urban commute (Denver)	RTT latency ms (median)	68	61	54	ICMP + Cloudflare
Urban commute (Denver)	Packet loss %	2.4	2.0	1.6	100-pkt ICMP
Rural highway (I-80 NE)	Download Mbps (median)	62 (48–81)	51 (39–67)	28 (18–41)	n=4/event
Rural highway (I-80 NE)	Upload Mbps (median)	11	9.2	4.8	Same
Suburban belt (Atlanta)	Download Mbps (median)	44	48	46	n=4/event
Suburban belt (Atlanta)	Jitter ms	16	14	12	ICMP
Off-peak control (all venues)	Download Mbps	168–214	172–208	178–226	Within ±10% noise

Ranges in parentheses are observed min–max across triplicates. Where I'm less sure: whether every 2026 US Mobile Premium SKU provisions identically—we tested Unlimited Premium on each host; Starter inherits different QCI and usage-policy framing.

{
  "@context": "https://schema.org",
  "@type": "Dataset",
  "name": "US Mobile Dark Star vs Warp vs Light Speed — peak-hour latency and throughput matrix (August 2026)",
  "description": "Cross-host comparison of US Mobile Unlimited Premium on Warp, Dark Star, and Light Speed across urban, rural, and suburban venue classes with QCI, RTT, and throughput medians.",
  "datePublished": "2026-08-31",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "inLanguage": "en-US",
  "isAccessibleForFree": true,
  "url": "https://networkscrutiny.com/guides/us-mobile-dark-star-vs-warp-vs-light-speed/#peak-hour-matrix"
}

---

The three networks at a glance

US Mobile brands three wholesale hosts. Each has its own site inventory, band portfolio, and congestion playbook—even when the retail tier name on your bill says "Unlimited Premium."

US Mobile brand	Host MNO	Best-known strength	Published QCI (August 2026)
Warp	Verizon	Rural highways, UW mmWave/C-band in cities	Premium 8 · Starter 9
Dark Star	AT&T	Suburban balance, improving mid-band	Premium 8 · Starter 9
Light Speed	T‑Mobile	Urban n41 capacity, low-latency feel	QCI 7 on every plan tier

For deeper QCI terminology, see US Mobile QCI levels explained. For Warp-specific Verizon positioning, see US Mobile Warp 5G review. For Teleport mechanics, see US Mobile network switcher guide.

Pros / cons — Dark Star vs Warp vs Light Speed

Network	Pros	Cons
Warp	Strongest rural Verizon footprint; Premium QCI 8; UW where device + map allow	City congestion on Verizon macros; Starter QCI 9 + ~70 GB policy note
Dark Star	Competitive suburbs; Premium QCI 8; Starter marketed unlimited high-speed	Peaks below T‑Mobile in some urban cores; AT&T fringe varies by county
Light Speed	QCI 7 on all tiers; best urban latency in our August 2026 matrix	Weakest rural gaps; QCI 7 ≠ fastest under load vs QCI 8 on other hosts per US Mobile

---

QCI priority: what the numbers actually mean

Congestion scheduling (QCI) and monthly usage policy are different levers. Shoppers comparing US Mobile Dark Star vs Warp often conflate them.

Published QCI map (all three hosts)

Plan tier	Warp	Dark Star	Light Speed
Unlimited Premium	QCI 8	QCI 8	QCI 7
Unlimited Starter	QCI 9	QCI 9	QCI 7
Flex / By-the-Gig	QCI 9	QCI 9 (+ optional QCI 8 add-on)	QCI 7

QCI 8 vs 9 on LTE non-GBR bearers: priority level 8 schedules ahead of level 9 when the sector is stressed (ETSI TS 123.203, accessed August 31, 2026). That only matters when the cell is contested—off-peak speed tests on the same band often overlap, as our control rows show.

Priority data caps and usage-policy thresholds

US Mobile's Unlimited Premium marketing emphasizes unlimited priority data on eligible networks where listed (get-started unlimited, verified August 31, 2026). Starter is where host differences bite:

Starter behavior	Warp	Dark Star	Light Speed
Published QCI	9	9	7
Usage-policy note in unlimited FAQs	May slow after heavy monthly use (~70 GB framing)	Marketed unlimited high-speed on-device	May slow after heavy monthly use (~70 GB framing)
Mechanism	Policy shaping plus QCI queue at congestion	Primarily QCI 9 congestion; different FAQ framing	Policy shaping plus QCI 7 scheduling

Anecdotally, Starter users who blow past 70 GB on Warp report slowdowns even at 2 a.m.—that pattern smells like policy, not deprioritization. Dark Star Starter threads sometimes confuse "no 70 GB note" with "immune to congestion"; both hosts still put Starter on QCI 9 when the scheduler is busy.

For field evidence on individual hosts, pair this guide with Dark Star vs Warp QCI priority tested and US Mobile Light Speed QCI test.

"QCI 8 on Warp or Dark Star will usually outperform QCI 7 on Light Speed during busy hours."

---

Latency and real-world performance

Speed tests reward short TCP bursts. Real apps—FaceTime, rideshare maps, iCloud photo backup—care about consistent RTT and low loss. Our August 2026 matrix shows Light Speed holding the lowest urban latency medians, but the gap narrows off-peak when all three hosts sit within measurement noise.

When QCI priority actually shows up

1. Idle tower sanity check — If speeds are poor off-peak with excellent RF, suspect coverage/backhaul—not deprioritization.
2. Busy-hour contrast — Repeat tests during commute peaks or venue exits when non-priority traffic typically collapses first.
3. Latency dispersion — Under load, deprioritized bearers sometimes show wider ping variance than priority tiers on the same band set.
4. Engineering hints — Some Android builds expose QoS or bearer labels; iOS hides most detail. Screenshots age quickly; prioritize repeatability over one-off novelty.

Dark Star versus Warp versus Light Speed comparisons go off the rails when testers change two variables at once (different cities, different phones, different times) and blame "QCI." Fix the tower, band, and time window first.

Host-network realities under congestion

Both Verizon and AT&T manage congestion differently from T‑Mobile's mid-band-heavy grid:

• Urban corridors — Light Speed's n41 density often delivers the lowest RTT in our August 2026 Denver runs; Warp and Dark Star can pin to different band combinations at the same intersection.
• Suburban belts — AT&T and Verizon often look interchangeable until schools dismiss or malls fill—then QoS strata separate faster. Dark Star edged Warp slightly in our Atlanta suburban anchor.
• Rural highways — Coverage breadth still dominates; Warp led our I-80 Nebraska medians by a wide margin. No QCI tier fixes a missing sector.

---

Named scenarios: who should pick which host

Marcus — I-80 trucker, Pixel 9, 40 GB/mo

Marcus runs Omaha ↔ Salt Lake weekly. Verizon macros dominate rural I-80 pins in our August 2026 coverage priors and field data (62 Mbps median on Warp vs 28 Mbps on Light Speed at the same rest-stop anchor). He should anchor on Warp Premium (QCI 8) and skip Light Speed experiments unless T‑Mobile wins at his home dock in Omaha. Dark Star is a fallback if AT&T RF at his Omaha yard beats Verizon—but our Nebraska highway data favors Warp.

Priya — UX lead in Austin, iPhone 16, 85 GB/mo hotspot

Priya lives in 78704 where T‑Mobile n41 is dense. Light Speed is her default—QCI 7 on every tier, lowest urban latency in comparable metros, and Premium bundles higher hotspot allowances per plan grid (~$32.50/mo monthly on usmobile.com/plans, checked August 31, 2026). If she Teleports to Dark Star for a Dallas client week, she inherits QCI 8 on Premium but loses Austin's T‑Mobile spectral advantage.

James — suburban Atlanta family, four lines, 120+ GB combined

James's household burns data on Warp Starter and hits the ~70 GB policy wall before month-end. Dark Star Starter is the steel-man case: US Mobile markets unlimited high-speed without the same threshold language—if AT&T RF at 30301 is solid (our August 2026 suburban anchor showed Dark Star 48 Mbps median, competitive with Warp 44 Mbps). He should run a two-week A/B on one line before moving the pool: coverage first, FAQ second, QCI third.

---

Steel-man: "Just pick Light Speed for QCI 7"

The best advocate says: Light Speed puts every plan on QCI 7, a higher published class than Warp/Dark Star Premium's QCI 8, and T‑Mobile's urban mid-band is the fastest feel in 2026 metros. Our August 2026 data shows Light Speed holding 54 ms urban RTT versus 68 ms on Warp. Why pay Verizon prices on Warp when the integer is worse?

Rebuttal: US Mobile's own QCI article warns that QCI 8 on Warp or Dark Star usually outperforms QCI 7 on Light Speed during busy hours because host implementation and capacity matter more than the label. QCI 7 on an empty T‑Mobile sector is glorious; QCI 7 at a sold-out stadium still queues. Meanwhile, Starter usage-policy on Warp/Light Speed can slow you after ~70 GB regardless of QCI—Dark Star's Starter FAQ framing is the outlier, not Light Speed's QCI integer. And our rural highway data shows Warp at 62 Mbps where Light Speed managed only 28 Mbps—coverage trumps QCI every time on I-80. Pick host coverage at your pins, then tier, then QCI.

---

Working checklist before you choose a host

1. Log RF at home, work, and commute — If one host is unusable, no QCI table saves you.
2. Match plan tier to congestion pain — Premium (QCI 8 on Warp/Dark Star) when rush-hour stalls are frequent; Starter only if towers stay quiet.
3. Read Starter usage FAQs for your host — Separate 70 GB policy from QCI 9 congestion.
4. Run peak-hour latency tests — Friday 5–7 PM at your worst commute PCI; triplicate, same phone model.
5. Count Teleport budget — Eight switches per 30 days; $2 after the first two unless Premium.
6. Prefer Multi-Network for two-home coverage instead of biweekly Teleport.
7. Re-check usmobile.com/plans — Wholesale disclosures change faster than blog tables.

---

Verdict

For most US Mobile Dark Star vs Warp vs Light Speed shoppers, the decision order is coverage → usage policy → QCI → latency under load. Warp remains the default when Verizon wins your geography—especially rural and interstate routines where our August 2026 data showed a 2× rural throughput advantage over Light Speed. Light Speed is the right call when T‑Mobile mid-band density at your pins justifies QCI 7 on every tier and you care about lowest urban RTT—accepting US Mobile's warning that the integer alone does not crown T‑Mobile king under load. Dark Star earns its place when AT&T is locally strong or when Starter-tier usage policy differences matter more than squeezing the last Mbps from QCI 8 on Verizon.

Between Dark Star and Warp on Unlimited Premium, treat them as coverage picks, not QCI picks—both are QCI 8. Use Teleport when you are committing to a new primary host; use Multi-Network when you need two grids without burning eight switches. I have not tested every 2026 handset OEM engineering menu for 5QI readouts—plan tier plus congestion-window behavior remains the practical ground truth.

---

Disclaimer

Network Scrutiny publishes independent research. We cite US Mobile's QCI article, plan pages, and Switch Network help for mapping and policy claims; we do not have access to live provisioning databases. Confirm pricing, hotspot limits, roaming, and reasonable-use policies on usmobile.com before you buy. Nothing here is legal or professional RF engineering advice.