Satellite texting in Australia: who has it, and where it stops

Since the July 2026 Telstra outage — a software defect that took out mobile services nationally and blocked some Triple Zero calls, and led to a Senate inquiry into emergency-call failures — satellite direct-to-cell has been widely described as the answer to Australians who cannot reach emergency services.

It is not, and Telstra says so plainly. Its own documentation states that Satellite Messaging “cannot be used to call 000 or 112”, that you cannot text Triple Zero directly, and that you should not rely on it in an emergency. The service is designed for places the mobile network never reached — not for the moments when it stops working.

The distinction matters because the two get conflated in coverage of the same story: a satellite link that can carry a text to your family cannot carry one to an ambulance. If emergency contact is what you need beyond coverage, the products that do it are Apple’s Emergency SOS via satellite, or a dedicated satellite messenger with an SOS service.

It is also not broadband. It no longer carries no data, though: Telstra has since opened the satellite link to a short list of low-bandwidth apps — Google and Apple Maps, AllTrails, CalTopo, Find My, WhatsApp, Signal, Messenger, Apple and Google Messages, Apple and Google Weather. These are adapted by their developers for intermittent, narrow connections; the experience is not the same as a mobile data connection, and nothing outside that list works.

Voice calls still do not exist over satellite-to-mobile in Australia, and neither does Triple Zero. Telstra says calling may follow. It has not.

And it only works outdoors, with a clear view of the sky. Telstra is explicit: inside a building, or even under a verandah, you likely will not connect. Messages are intermittent — some arrive almost instantly, others take minutes or longer, depending on whether a Direct to Cell satellite happens to be overhead.

Telstra reported around 120,000 connections a day to the satellite-to-mobile service on average, across Australia. That is connections rather than users, and it counts a phone finding a satellite rather than a message anyone needed to send — but it is the only published figure of its kind.

The more telling number came from the Victorian bushfires around Longwood and Harcourt, where Telstra saw a three-fold increase in satellite messaging connections after fire damage and power outages knocked out parts of the mobile network. That is the case the technology is genuinely for: not remote travel, but a terrestrial network that has stopped working.

Most outdoor areas of mainland Australia and Tasmania, plus immediate offshore areas. The service only activates beyond the reach of the Telstra mobile network — in coverage, your phone uses the tower.

Two areas are excluded outright: the Australian Radio Quiet Zone in Western Australia, and remote offshore territories and islands. Both carriers say so. Optus’s own announcement carried an asterisk on its “100% of Australia” claim, excluding the Quiet Zone — in its words, an area where no service is allowed.

On the water: “immediate offshore” is the operative phrase. This is not an offshore passage-making solution. If you are crossing to a remote island or heading properly out to sea, you are back to a dish — see Starlink for boats, where the 12-nautical-mile rule does the same work this exclusion does.

Neither carrier tells you which towns are inside it. The zone is defined around a point at 26°42′15″S, 116°39′32″E, roughly 350 km north-east of Geraldton, where the Murchison Radio-astronomy Observatory sits. Radio astronomy is the primary spectrum user inside a 70 km inner zone, and coordination zones extend to a 260 km radius depending on frequency.

That larger circle covers about 212,000 km² — not far off the size of Victoria. Here is what sits inside it, measured from the zone centre to each gazetted townsite:

Zone centre and radii: Australian Radio Quiet Zone WA, as administered under ACMA’s frequency band plan and RALI MS32. Town coordinates: Composite Gazetteer of Australia (Geoscience Australia), gazetted townsite points, GDA94. Distances are great-circle from the zone centre and are ours, not the carrier’s.

There is an irony worth naming. The Quiet Zone exists because it is radio-silent — it is the quietest place in the country, which is why one of the world’s most sensitive radio telescopes is there. The nearest mobile tower is at Cue, about 150 km away. The technology built to erase mobile dead zones is switched off over the most deliberate dead zone in Australia, to protect the instrument that exists because of it.

Satellite messaging only switches on where the mobile network ends. So the question of where it ends is the whole precondition — and it ends further out than people think.

The ACCC’s 2025 mobile infrastructure data records 11,767 Telstra sites, of which 5,343 carry 4G and no 5G at all. Those 4G-only sites sit a median 236 km from the nearest of Sydney, Melbourne, Brisbane or Perth. Telstra’s 5G sites sit a median 55 km out. 5G is a city technology. Where your readers live, the network is 4G, and past that it is nothing.

The same dataset holds one more thing worth knowing: 58 Telstra sites are satellite-backhauled small cells — mobile towers whose connection to the world is itself a satellite, a median 1,726 km from a capital, the furthest 2,721 km. Not one carries a 5G band.

ACCC Mobile Infrastructure Report 2025 data release, site-level band records for Telstra, Optus and TPG. Distances calculated by us. The ACCC’s own interpretation guide warns that the carriers interpreted the reporting requirements differently, so we do not compare coverage maps between them.

Optus signed with SpaceX and planned SMS from late 2024, with voice and data to follow in late 2025. It confirmed to iTnews that it missed that deadline and was re-evaluating its timelines after SpaceX hit regulatory hurdles in the United States. Its own page still describes the service as coming.

TPG Telecom sent Australia’s first direct-to-smartphone text messages over the Vodafone network using Lynk Global satellites in May 2025, from rural New South Wales. No rollout date has been announced. TPG’s published coverage maps also exclude what it reaches through its roaming agreement with Optus, which is worth remembering whenever you see them compared.

AST SpaceMobile signed a memorandum of understanding with Optus in September 2022 to test direct satellite-to-mobile technology. Its BlueBird satellites are in orbit and you can watch them pass.