What It Can And Can’t Replace

Satellite telephony has been around for several decades, but it’s a technology that has resisted democratization as connectivity on smartphones remains limited in utility. The tech industry still primarily frames it as a backup option to accessing emergency services when standard cell service is unavailable. Those limitations haven’t stopped T-Mobile, however, from partnering with Elon Musk’s SpaceX to offer T-Satellite, a dedicated wireless service that connects users to the internet through Starlink low Earth orbit units with direct-to-cell capabilities. Whether you’re a T-Mobile customer or not, you’re able to subscribe to T-Satellite for $10 a month. It’s also free if you pay for the carrier’s Experience Beyond plans.

There’s a surprising amount you can do with Starlink direct-to-cell capabilities through T-Satellite. T-Mobile lists more than a couple dozen optimized apps that cover messaging (SMS and IP-based, video included), navigation, fitness, weather, and safety information. Some apps outside the official list have been reported to work as well, but your mileage may vary. On more pressing factors, speeds are limited, coverage can still be spotty, and a crucial part of the experience also depends on how you subscribe to T-Satellite, whether as a T-Mobile or as an a la carte eSIM.

T-Satellite launched as a beta offering in January of 2025 and transitioned to full service in July of that year. The program effectively transforms Starlink’s LEO direct-to-cell satellites into extremely powerful 4G LTE towers. Over part of the trial period, researchers at Universidad Politécnica de Madrid with help from Weplan Analytics estimated fair-condition speeds of 4 Mbps. Changes in regulation along with technical improvements could bump the cap closer to 12 Mbps, but these developments will take time to unfold. Clearly, though, you should adjust your expectations from the speeds you typically get on T-Mobile 5G, which the company’s marketing says can reach as high as 561 Mbps.

So, how about real-world usage? One beta tester from April said they were able to make a WhatsApp video call from within the Angeles National Forest near Los Angeles. Meta’s video messaging services use extremely data-efficient AV1 compression instead of traditional methods like H.264, which is part of why WhatsApp and Facebook Messenger are on T-Satellite’s app list. More recently, a subscriber who was able to benchmark their T-Satellite connection off the island of Kauai in Hawaii, recorded a downlink of 1.7Mbps, an uplink of about 200kbps, and latency of more than 200ms. SpaceX is aiming to get latency for its dedicated terminal owners down to 20ms, but again, only time will tell if the company meets its goal.

One of the usual perks to satellite internet coverage is that you can get it pretty much anywhere. Not so with T-Satellite. T-Satellite covers the continental United States plus southern Alaska, Hawaii, and Puerto Rico—that means some remote regions and outlying territories within those borders aren’t advertised to receive coverage. Roaming agreements also allow you to use the service in Australia, Canada, Japan, and New Zealand, though texting emergency services in Japan is not possible.

Crucially, coverage isn’t always going to be there of the time, even if you’ve got a clear view to the sky. Service is distributed via eSIM, so you’ll need a compatible phone as well as support for T-Mobile LTE bands. You’ll also need to set up your device so that it knows to fall back onto the T-Satellite eSIM when you’re out of your primary carrier’s reach. Ultimately, this means you’ll likely end up in areas where your phone can’t make a determination of whether to connect to a distant terrestrial cell or Starlink, so you’ll need to be patient and prepared to walk around.