Is your phone compatible with Super LTE and GSM LTE?

Quick heads up before we dig in. Super LTE is now called Warp. GSM LTE evolved into what we now call Light Speed. Same networks under the hood, fresh names, and a third network has joined the lineup since this article first went live: Dark Star. If you landed here looking for compatibility info on Super LTE or GSM LTE, you’re in the right place. We’ll cover what changed, what stayed the same, and exactly how to figure out which network fits your phone best.

US Mobile partners with the three largest network operators in the country, so you get the same coverage and speeds as the big carriers without the contracts, bloated bills, or surprise fees. You also get something the big three don’t offer: the ability to switch between networks (or run two or three at once on a single plan) inside one app.

Here’s the full breakdown of each network, what your phone needs to work on it, and how to check compatibility in under a minute.

Warp (formerly Super LTE)

Warp is the rebranded version of Super LTE. If you remember the black SIM card from the old US Mobile starter kit, that was Warp. The network runs on the same infrastructure as the largest premium carrier in the country, which means strong coverage in dense urban areas, suburbs, and most rural pockets.

Who Warp is best for

• You want the broadest 5G footprint in the country.
• You live or work in a building where reception has historically been spotty on other carriers.
• You want premium data priority during peak hours (available on Unlimited Premium).
• You travel often and want fast speeds in major metros.

Phone compatibility for Warp

Warp works on most factory unlocked 4G LTE and 5G phones built since 2018. Your phone needs to support HD Voice (also called VoLTE or Enhanced Calling) and the right LTE bands. Most Apple, Samsung, Google Pixel, and OnePlus phones sold in the US fit the bill. The key bands to check are Bands 2, 4, and 13.

Newer iPhones (XS and later) and Samsung Galaxy phones (S20 and later) also support eSIM, which is the fastest way to get on Warp.

Light Speed (formerly GSM LTE)

Light Speed is the network that grew out of the original GSM LTE service. The white SIM card from the old days has been replaced by the Light Speed SIM, but the underlying network has been upgraded to deliver faster speeds and broader 5G coverage than the legacy GSM service. If your phone used to work on GSM LTE, it will almost certainly work on Light Speed.

Who Light Speed is best for

• You want a balanced mix of coverage and speed at a great price.
• You live in a region with strong GSM coverage and want consistent service.
• You’re bringing over an older device that originally worked on a GSM-based carrier.
• You want the option to use international by-the-gig or roaming features.

Phone compatibility for Light Speed

Light Speed has the broadest device compatibility of any US Mobile network. If your phone supports LTE Band 4 (1700/2100 MHz), it should work. Phones that only support 2G or 3G are no longer supported on this network. Apple, Samsung, Pixel, OnePlus, Motorola, LG, and most other major manufacturers ship phones that work on Light Speed without any extra setup.

Dark Star (the newest network)

Dark Star is the newest addition to the US Mobile lineup and didn’t exist when this article first ran. It runs on a third major network, giving you another option if Warp or Light Speed don’t perform well in your area. Most modern phones can activate on Dark Star instantly through eSIM.

Who Dark Star is best for

• You’ve tried other networks in your area and want a third option.
• You want access to features like RCS messaging on iPhone, which is currently exclusive to Dark Star at US Mobile.
• You want fast hotspot speeds without paying premium pricing.
• You want a network that supports international roaming as part of your plan.

Phone compatibility for Dark Star

Dark Star works with most modern unlocked phones, including all recent iPhones and flagship Android devices. It supports both eSIM and physical SIM activation. If you’re on an Android device and you want to skip manual setup, Dark Star ships an APN configuration profile you can download and install in seconds.

How to check if your phone is compatible

The fastest way to confirm which of our three networks work with your phone is to send us your make, model, and IMEI. Our team will check it against our network databases and tell you exactly which networks support your device. Here’s how to do it.

Phone bands and why they matter

Cellular networks broadcast on specific radio frequencies called bands. Your phone needs to physically support those bands to connect. A phone built for the European market might miss a band that’s standard in the US, which is why an unlocked phone bought overseas sometimes won’t work here even if it’s brand new.

Each of our three networks (Warp, Light Speed, Dark Star) requires a slightly different mix of LTE and 5G bands. The exact compatibility depends on the make, model, and region your phone was built for, which is why we don’t recommend trying to memorize a band chart.

The fastest way to confirm what your phone supports is to send your make, model, and IMEI to our team. We’ll tell you exactly which networks your device can run on. Reach us through any of the following:

• Live chat: usmobile.com/chat
• Email: [email protected]
• Phone: (878) 205-0088

Support is available 24/7. Most compatibility checks take under five minutes.

Activating with eSIM

Almost every modern phone supports eSIM, which is the way to go for activation on US Mobile. The whole process takes about five minutes. You pick a plan, scan a QR code, and you’re live on the network. No waiting for shipping, no fiddling with a SIM tray, no risk of losing or damaging a physical card. Switching networks later is also instant when you’re on eSIM.

If your phone is an iPhone XS or newer, a Samsung Galaxy S20 or newer, a recent Pixel, or just about any flagship Android made in the last few years, you’re good to go. Not sure if your phone supports eSIM? Reach out to support and we’ll confirm before you commit.

How to pick the right network for you

The honest answer is that coverage performance is hard to predict from a map alone. The signal that one carrier shows as “excellent” in your zip code might still drop calls in the back office of your house. The cleanest way to pick is to test.

Start with the network you think suits you best. If it works, you’re done. If it doesn’t, you have two options:

1. Switch networks. You can move your line to another network any time inside the app. Your first two switches are free, then it’s $2 per switch (or always free on Unlimited Premium).
2. Run two or three networks at once. Add multi-network to your plan and use a different network at home, at work, and on the road. New customers get the multi-network add-on free for the first two billing cycles.

Want a deeper head-to-head? We’ve broken down each pairing in detail:

• Warp vs Light Speed
• Dark Star vs Light Speed
• Warp vs Dark Star

Plans available on all three networks

Once you know your phone is compatible, here’s what you’ll pay. Every plan below works on Warp, Light Speed, and Dark Star, with taxes and fees included.

Plan	Price	Data	Best for
Light Plan	$10/mo	2 GB	Light users, kids’ phones, backup lines
Unlimited Flex	$17.50/mo	Unlimited (10 GB high speed)	Casual users who want unlimited talk and text
Unlimited Starter	$25/mo	Unlimited (high speed varies by network)	Most users, heavy streamers
Unlimited Premium	$44/mo	Unlimited (always high speed)	Power users, frequent travelers, hotspot heavy

Annual plans knock 20 to 25 percent off the monthly price. Unlimited Starter has the steepest annual discount at $30 off when paid yearly. Network switches are free on Unlimited Premium and capped at $2 each after the first two on every other plan.

Ready to get started?

If you’ve confirmed your phone is compatible, activation takes about five minutes. Pick the plan that fits your needs, complete checkout, and scan the QR code we send you. Your line is live the moment you scan it. No SIM card to wait for, no setup headaches.

Still not sure which network is right for you? Head to our Networks page for a side-by-side comparison, or reach our 24/7 support team via live chat, email at [email protected], or phone at (878) 205-0088. We’ll help you figure out the best fit before you commit.

Frequently asked questions

Note: US Mobile service only works with factory unlocked 4G LTE and 5G phones. We do not unlock devices that are locked to other carriers. If you’re not sure whether your phone is locked, here’s a quick primer on locked vs unlocked phones.