US Mobile’s Three Networks Explained: Warp, Dark Star, and Light Speed

Most carriers give you one network. US Mobile gives you a choice of three, and lets you move between them whenever you want.

That is genuinely useful. It is also confusing, because the networks have invented names and US Mobile only names the operator behind some of them.

Let us fix that.

Whose towers are behind each network?

Two of the three are named by US Mobile itself. The third is not.

Their device unlocking guide carries a section headed “AT&T-locked devices (for use on Dark Star)” and another headed “T-Mobile-locked devices (for use on Light Speed)”. That is US Mobile stating the mapping directly for those two.

So, as of August 2026:

  • Warp is widely reported to run on Verizon, and behaves that way in coverage terms, but we have not found US Mobile naming the operator for this one anywhere on their site, blog or help docs
  • Dark Star runs on AT&T. US Mobile says so itself
  • Light Speed runs on T-Mobile. Same source

Dark Star and Light Speed are confirmed by US Mobile. Warp is strongly established rather than officially confirmed, and we are not going to present it as something they have said. If it matters to your decision, the practical test is simpler than the trivia anyway: check which of the big three actually works where you live, then pick the matching network.

What US Mobile says about each

From their own network comparison:

Warp - described as their MVP. The fastest headline speeds of the three, listed at up to 3 Gbps. The important one: priority data on 5G devices.

Dark Star - described as unmatched coverage. Listed at up to 2 Gbps. High speed data, with a prioritized data add-on available separately.

Light Speed - described as speed and compatibility. Listed at up to 1.5 Gbps, the lowest of the three.

All three list instant activation with eSIM, WiFi calling, hotspot data included, and international roaming.

On roaming, check the current figures yourself. US Mobile lists a country count for each network, but the number it shows differs depending on whether you are reading on a desktop or a phone, so we are not going to publish one. Roaming coverage does differ by network. Open their networks page on the device in your hand and read what it says today.

The difference that actually matters

Ignore the headline speeds. You will never notice the gap between them on a phone.

Priority data is the real differentiator, and it is a Warp thing.

Deprioritization is the standard tradeoff of going with an MVNO. When a tower gets congested, the network operator’s own customers get served first and you wait. It is the main thing you give up for a cheaper bill.

Warp offering priority data on 5G devices is US Mobile pushing back on exactly that tradeoff. If you have ever been at a busy event watching your data crawl while everyone else seems fine, that is the problem this addresses.

Is US Mobile Warp deprioritized?

US Mobile lists priority data on 5G devices for Warp, and unusually for this industry it publishes the actual numbers rather than leaving you to guess.

What QCI does each US Mobile network use?

US Mobile publishes a full mapping by network and plan. As of August 2026:

US Mobile’s published QCI mapping, August 2026.
Network and plan QCI
Light Speed, all plans QCI 7 as standard priority
Warp, Unlimited Premium QCI 8 included
Warp, Unlimited Starter QCI 9
Dark Star, Unlimited Premium QCI 8 included
Dark Star, Unlimited Starter QCI 9
Dark Star, Unlimited Flex and By the Gig QCI 9, with an optional QCI 8 add-on
Dark Star, QCI 7 In closed beta with VIP customers

The trap is comparing those numbers across networks, and US Mobile says so themselves. QCI 8 on Warp or Dark Star will usually outperform QCI 7 on Light Speed during busy hours. The network matters as much as the number, so Light Speed carrying the lowest figure does not make it the best choice.

What US Mobile does not put a number on is how any of this ranks against the network owner’s own postpaid customers, so treat a Warp plan as better than a standard MVNO plan rather than as identical to a postpaid line.

Dark Star offers a prioritized data add-on as a paid extra. Light Speed does not list one.

The other practical differences

Coverage. Dark Star is positioned as the widest coverage option. If you spend time in rural areas or somewhere the other two struggle, that is the one to try first.

International roaming. All three include it and the footprint differs by network. Light Speed listed the widest of the three in every version of that page we checked, but the ordering of the other two flips between US Mobile’s desktop and mobile layouts, so check the current lists rather than trusting any count, including one quoted here.

Smartwatches are Warp only. If you want a cellular Apple Watch or Pixel Watch on US Mobile, you need to be on Warp. The other two networks do not support watch plans at all. That is a hard constraint, not a preference.

One line, three networks, and the switch between themYour line sits on the left. It runs into a switch labelled Teleport, which fans out to three separate networks named Warp, Dark Star and Light Speed, each ending at its own cell tower. The line uses one of the three at a time, and Teleport is what moves it between them. The diagram does not name the operator behind any of the three networks.Your lineTeleportWarpDark StarLight SpeedOne network at a time. Teleport moves your line.
Your line sits on one of the three networks, and Teleport is what moves it to another. Which operator runs each network is a separate question, and not one every network answers publicly.

You can switch, and that is the point

US Mobile calls it Teleport. You move your line from one network to another without changing providers, without a new account, and without starting over.

It is not always free, and it is worth knowing the terms before you plan around it. On Unlimited Premium, network transfers are included at no cost. Without that, US Mobile says your first two transfers ever, not per billing cycle, are free, and each one after that costs $2. Their Starter and Flex plans list that $2 per transfer directly on the plan card.

That is still the single best reason to consider US Mobile if you are not certain which network works where you live. Every other carrier makes you guess right the first time. Here you can try one, and if it disappoints, move.

If you want lines on different networks under one plan, US Mobile also offers a multi-network add-on that shares an unlimited plan across them. It runs $10 a month, or $7.50 a month on an annual plan, and is offered on Unlimited Premium and Starter lines. Useful for a household where one person’s coverage needs differ from another’s.

So which one should you pick

If you do not know which network works where you live - start with Warp. It has priority data and it supports watches, so it is the least likely to leave you wanting something you cannot have. Then use Teleport if it disappoints.

If you are rural, or the others have failed you before - Dark Star.

If you travel internationally a lot - Light Speed listed the widest roaming footprint in every version of their page we checked, but confirm the current list before you decide on that basis.

If you want a cellular watch - Warp. No alternative.

And if you already know from experience which of the big three works at your house, just pick the matching network and skip the trial and error entirely.

If Warp is where you are leaning, it is worth seeing how it compares with Visible, which is the other main way onto that same network.

Last verified: August 2026. Network features, speeds, and roaming coverage change. Everything here was checked against US Mobile’s own published information. Confirm the current details before you sign up.

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Not sure a switch is worth the hassle? Here is what actually happens to your phone number when you move carriers.

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