US Mobile leases towers from all three major U.S. carriers: Verizon (branded as Warp), T-Mobile (branded as Light Speed), and AT&T (branded as Dark Star). Because US Mobile is a Mobile Virtual Network Operator (MVNO) and does not own its own cell towers, it relies on these partnerships to deliver coverage, with all three networks offering nationwide 5G and native international roaming.
US Mobile network brands explained
US Mobile brands its three network options to help you identify which carrier's infrastructure powers your service. Warp (formerly Super LTE) runs on Verizon's nationwide 4G LTE and 5G infrastructure. Light Speed (formerly GSM 5G or GSM LTE) runs on T-Mobile's nationwide network. Dark Star operates on AT&T's nationwide network. All three networks are powered with nationwide 5G for fast speeds and support native international roaming. Since US Mobile is an MVNO, it does not own any towers, it simply leases access from these carriers.
How to switch between networks
You can switch between Warp, Dark Star, and Light Speed networks directly from the US Mobile app. Follow these steps:
- Open the US Mobile app and sign in.
- Select the "Lines" tab, then choose the line you want to switch.
- Go to "Line Settings" and select "Switch Network" under "Plan Management options."
- Choose whether you want to use an eSIM or a physical SIM card for the new network.
Before switching, connect to Wi-Fi, as the process may cause a brief pause in service. You can switch networks once every 4 hours, up to a maximum of 8 times per 30-day cycle. The first two network switches are free; subsequent switches cost $2 each, unless you are on an Unlimited Premium plan, where switching is always free.
Multi-Network add-on
US Mobile offers a Multi-Network add-on that allows access to two or all three networks on one plan. This enables you to test different networks or have multiple lines on different networks. However, a single US Mobile plan does not give simultaneous access to all three carriers on one line, you pick a specific network for your plan to run on. The Multi-Network add-on is free for the first two billing cycles for new customers, then costs $10 per month per network ($7.50 per month if billed annually).
Device compatibility and requirements
To use US Mobile, your device must be a factory unlocked 4G LTE or 5G phone that supports HD Voice (also called VoLTE or Enhanced Calling). The fastest way to check phone compatibility is to provide your phone's IMEI, make, and model to US Mobile support via live chat at usmobile.com/chat, email at help@usmobile.com, or by calling (878) 205-0088.
Frequently Asked Questions
Can I bring my own device to US Mobile?
Yes, US Mobile supports bring your own device (BYOD) for all three networks. As long as your phone is factory unlocked and supports HD Voice, you can use your existing device without needing to purchase a new one.
Does US Mobile offer 5G coverage?
Yes. All three US Mobile networks, Warp, Light Speed, and Dark Star, are powered with nationwide 5G for fast speeds. Your experience depends on the underlying carrier's 5G deployment in your area.
Can I switch between networks at any time?
You can switch networks at any time, but there is a 4-hour cooldown between switches and an 8-switch limit per 30-day cycle. The first two switches each cycle are free; after that, a $2 fee applies unless you are on an Unlimited Premium plan.
Are there any extra fees for choosing a specific network?
No. US Mobile does not charge any additional fees for choosing Warp, Light Speed, or Dark Star. You have the flexibility to select your preferred network based on coverage and performance without incurring extra costs.
What is the T-Mobile network and coverage like on US Mobile?
Light Speed runs on the T-Mobile network and coverage, giving you access to T-Mobile Network Coverage and Service Quality nationwide, including its 5G footprint. This option is ideal if you want T-Mobile's extensive mid-band 5G and strong urban coverage.
