Speedtest data highlights the early usage of T-Mobile’s T-Satellite service, which works on most new iOS and Android smartphones released in the past 2-4 years. The service is available to T-Mobile customers as well as customers of AT&T, Verizon and other providers.

Editor’s note: This article was updated on October 17 to include information about devices connecting to Starlink that also registered as having active service.

T-Mobile first announced its satellite plans with partner SpaceX in August 2022, just before Apple unveiled its own satellite partnership with Globalstar. Fast forward to 2025 and T-Mobile officially launched its satellite texting service with SpaceX on July 23.

Now, Ookla Speedtest® data provides a look at the early usage of T-Mobile’s T-Satellite service across T-Mobile, AT&T, Verizon and FirstNet users. (FirstNet is for public-safety customers and runs over AT&T’s network.) The below data is derived from Android smartphones that registered with SpaceX Starlink satellites at some point between December 2024 and September 2025.

Key Takeaways:

• T-Mobile customers accounted for roughly 60% of all connections. When only counting devices that reported having active service at the time of their Starlink connection, that figure rose to 70.8%.
• Los Angeles County, California, was the country’s most popular location for T-Satellite activity. This massive county contains both the city of Los Angeles and Angeles National Forest, an area known for its rugged mountains, steep canyons and extensive trail systems. It’s also where T-Mobile deployed free T-Satellite text messaging services in the early days of 2025, amid multiple wildfires.
• The median download and upload speeds of Starlink’s fixed internet service showed no signs of degradation amid the testing and launch of T-Mobile’s T-Satellite service this year. That’s likely due to the fact that Starlink’s smartphone-capable satellites are different from those supporting its fixed internet service.

T-Satellite Rockets into the Commercial Marketplace

Direct to device (D2D) technology connects smartphones directly to satellites for text messaging and other services, primarily in outdoor, rural areas where no other connections exist. Those satellites are hundreds of miles above the Earth, traveling thousands of miles an hour. Thus, such phone-to-satellite connections represent an impressive technological feat considering standard, terrestrial cellular networks connect smartphones to stationary cell towers that are on the ground, usually just a few miles away.

Apple, via Globalstar’s satellites and spectrum holdings, pioneered the D2D market. Every iPhone since the iPhone 14, introduced in 2022, can send and receive text messages through these satellites. In September, Apple expanded D2D into its lineup of smartwatches.

But Apple isn’t the only D2D player to achieve liftoff.

T-Mobile first unveiled its satellite ambitions in 2022, via a public press conference featuring outgoing T-Mobile CEO Mike Sievert and SpaceX’s Elon Musk. The companies promised a service that could connect smartphones directly to SpaceX’s Starlink satellites via a sliver of T-Mobile’s licensed spectrum holdings. Unlike Apple and Globalstar’s offering, this setup doesn’t require users to purchase a new phone.

SpaceX began launching satellites in support of its D2D service starting in early 2024.

Then, in February of 2025, T-Mobile launched a beta test of its SpaceX-powered T-Satellite text messaging service, complete with a high-profile Super Bowl advertisement. Importantly, T-Mobile offered the beta service for free, for three months, to its own customers as well as customers of its rivals, AT&T and Verizon. T-Mobile said it gradually added users to the service as part of its testing efforts, eventually gaining 2 million signups for the beta and 30,000 daily users, including “hundreds of thousands” of customers from AT&T and Verizon.

Finally, T-Mobile commercially launched its T-Satellite messaging service in July 2025, with around 650 Starlink satellites. The offering is now available at no extra cost to T-Mobile customers on the operator’s Experience Beyond plan (which starts at $100 per month). For other customers – including T-Mobile customers on other plans, as well as those of AT&T and Verizon – it’s available for an extra $10 per month. Non-T-Mobile customers can access the service via an eSIM.

Ookla Speedtest data captured throughout 2025 shows growing interest in T-Satellite:

As of September 2025, T-Mobile customers remained the biggest group of users connecting to SpaceX’s D2D satellites. But AT&T customers also show links to those satellites:

However, when only counting the Android devices that reported having active service (rather than counting both devices with active service as well as devices without) the figures are a bit different:

This fluctuation may simply be due to the fact that D2D is a relatively new technology and therefore device settings may vary depending on the gadget’s make, model, and operator settings.

Also, it’s possible that Verizon customers aren’t showing as much interest in T-Satellite because of Verizon’s 2024 agreement with Skylo. Skylo doesn’t operate its own satellites, but it does purchase connectivity from those that do, including Viasat, Ligado Networks, TerreStar and EchoStar.

Verizon began offering Skylo-powered text messaging in emergency situations in January 2025 on Samsung Galaxy S25 series smartphones. Since then it has added support for newer Google Pixel phones, and it expanded the service into regular, nonemergency situations.

AT&T, meanwhile, has an agreement with satellite operator AST SpaceMobile. That company hopes to begin offering intermittent satellite connections to AT&T and Verizon customers starting later this year. AST SpaceMobile has promised more continuous service in 2026 as it adds more satellites to its planned constellation.

National Forests and National Parks are Top Locations for D2D Users

This interactive map displays the locations where Speedtest data showed a Starlink D2D connection over the course of 2025:

And here is a list of the top five U.S. counties by total D2D device connections over the course of 2025:

1. Los Angeles County, California
2. Larimer County, Colorado
3. Teton County, Wyoming
4. Mohave County, Arizona
5. Mineral County, Montana

That Los Angeles County is the most popular location for T-Satellite D2D connections is interesting. Although the city of Los Angeles sits in the southern portion of Los Angeles County, California, the Angeles National Forest sits in the northern part. This remote area contains several wilderness zones, including the Cucamonga Wilderness, Magic Mountain Wilderness, and Pleasant View Ridge Wilderness, as well as a portion of the Pacific Crest Trail.

Cellular coverage throughout the northern portion of Los Angeles County is poor or nonexistant:

Los Angeles County has also been the scene of several major wildfires this year, including the Palisades and Eaton Fires in January 2025. In one of its first public D2D forays, T-Mobile delivered free Starlink D2D messaging to 198,000 users in areas affected by those January wildfires.

Other top D2D locations in the U.S. feature geographic characteristics similar to that of Los Angeles County. For example, Larimer County, Colorado, is located in the northern part of the state and contains parts of Rocky Mountain National Park and Roosevelt National Forest. Similarly, Teton County, Wyoming, is the home of Grand Teton National Park and a significant portion of Yellowstone National Park. And Mohave County, Arizona, includes parts of Grand Canyon National Park, Lake Mead National Recreation Area and the Mojave Desert. All of these areas sport at least some cellular dead zones.

D2D Connections are Relatively Rare

National forests and national parks are vacation destinations, visited occasionally. Based on Ookla Speedtest data, U.S. users are in reach of a cellular network the vast majority of the time.

This data reflects the fact that homes, offices, coffee shops, schools and other familiar locations – in cities and towns with cellular coverage – are where most users spend the bulk of their time. It also highlights the impressive coverage provided by the 651,000 cell sites around the U.S. These sites – from massive cell towers to small cells atop light posts – cover most populated areas (while Wi-Fi covers most indoor locations).

The 2.79% of the time when the average U.S. user isn’t connected to a cellular network is where the D2D market can play. Clearly, 2.79% is a relatively small slice of time, but it may also represent the hours when an internet connection might be the most useful. Whether it’s a flat tire in the middle of nowhere or a broken ankle on a mountainside, users may place a value on a D2D satellite connection far in excess of the time they actually spend on it.

For example, in a recent survey of around 1,000 smartphone users, the financial analysts at TD Cowen found that more than 60% would pay at least $5 per month for some kind of satellite D2D service. That’s worth an additional $3 billion in additional annualized revenue for the U.S. wireless industry.

This is why so many companies are investing into the D2D industry. Lynk Global, AST SpaceMobile, Viasat and Iridium are among the companies planning or building satellite constellations for D2D services. Others, like Amazon’s Kuiper, may add D2D capabilities to their satellites at a later date.

That said, D2D market leaders aren’t standing still. SpaceX recently inked a $17 billion deal to acquire spectrum from EchoStar to help expand its D2D service beyond text messaging. And Apple is plowing $1.7 billion into its satellite partner Globalstar for the construction of a new satellite constellation with as-yet-unannounced capabilities.

SpaceX may have Big Plans for Starlink and D2D

SpaceX has been using its rocket-launching business to build out its Starlink satellite internet constellation, which now stretches across 8,000 satellites and roughly 7 million global fixed internet customers. SpaceX’s rockets add satellites to Starlink’s constellation on an almost daily basis.

However, Starlink’s D2D satellites are separate and apart from those dedicated to the company’s fixed internet business (although both types of satellites share the same backhaul links). This is why Starlink’s fixed internet speeds in the U.S. haven’t been affected by the testing and launch of T-Mobile’s T-Satellite service.

This is important because SpaceX has so far received $478 million in grants from the U.S. government’s Broadband Equity, Access and Deployment (BEAD) program. That money is intended to bring fixed internet connections to almost 300,000 rural locations across the U.S.

Starlink’s D2D business currently runs over about 650 satellites. When those satellites orbit beyond the borders of the U.S., they’re used by other cellular operators in Starlink’s Direct to Cell program including Rogers (Canada), Optus (Australia), Telstra (Australia), KDDI (Japan), Entel (Chile & Peru) and Kyivstar (Ukraine). The service has proven so popular that New Zealand mobile operator One has reportedly expanded the amount of licensed spectrum it will run through Starlink’s satellites from 5 MHz to 15 MHz. And Starlink recently claimed 7 million D2D users globally.

But satellite-powered text messaging isn’t the end of Starlink’s D2D ambitions. Already T-Mobile and other Starlink partners are beginning to deploy some early data services. For T-Satellite users, those data services are restricted to select smartphone apps including AccuWeather, AllTrails, Google Maps, Google Messages, onX Backcountry, WhatsApp, X and Apple apps like Maps, Messages and Music. And T-Mobile is working to temper early users’ expectations.

“Satellite connections aren’t always instant – because satellites move overhead, your phone may need a moment to find one,” T-Mobile warns. “If you don’t see signal right away, just give it a little time and try again. This isn’t high speed data, but it’s built for what matters most off grid.”

SpaceX is working to speed things up. With the $17 billion in spectrum it purchased from EchoStar, SpaceX says it expects to ultimately provide D2D data speeds generally comparable to those on 4G LTE networks. According to Ookla Speedtest Intelligence, 4G operators in the U.S. provided 33 Mbps median download speeds and 4 Mbps median upload speeds in 2024.

SpaceX has already asked the FCC for permission to launch as many as 15,000 D2D satellites in pursuit of this objective. The company must also work with phone vendors to ensure its new spectrum licenses are supported in future phones.

Should existing cellular operators worry about all this? Maybe, according to SpaceX’s Elon Musk. When asked whether Starlink could become a global phone carrier in the future, “that would be one of the options,” Musk replied. But he added that “we’re not going to put the other carriers out of business. They’re still going to be around because they own a lot of spectrum. But yes, you should be able to have Starlink like you have an AT&T, or T-Mobile, or Verizon or whatever.”

When asked the same question in a different venue, SpaceX’s Gwynne Shotwell was a little more circumspect: “We will be initiating discussions with telcos in a different way now,” she said. “It’s our spectrum, but we want to work with them, almost providing wholesale capacity to their customers. We have to work with the device manufacturers, the chip companies, and working with telcos on the end game. It’s really exciting, but it’s a huge amount of work.”