Summary

  • The 27 July test reached the government's benchmark for broadcasting from mobile towers. That figure was not a count of people receiving a warning.
  • New South Wales officials had asked about reception, safety and authority in June, before the national test—not after it.

At the press briefing after Australia's national AusAlert test, a reporter asked a simple question: what proportion of phones had received the message? The answer was not the number that had just made the headlines. Emergency Management Minister Kristy McBain said she would need to go to the telecommunications partners for that information.

The 27 July briefing had a result worth announcing. Operators reported that 94% of targeted mobile towers had broadcast the test alert, above the National Emergency Management Agency's 90% benchmark. It demonstrated a large-scale broadcast. It did not establish a 94% reception rate among phones, let alone among people.

That distinction had already occupied officials in New South Wales. Their questions arrived in a letter dated 18 June, while community trials were under way. Released in October, it is a document about preparing for the national test, not a verdict delivered after it.

The question at the receiving end

The letter to NEMA came from Trent Curtin of NSW Rural Fire Service, Rania Wannous of NSW Telco Authority and Sam Toohey of Premier's Department. They wanted the test's scope and success criteria, but also a comparison that would bring the results closer to everyday experience: an estimate of devices present in the test area against the number receiving an alert.

They asked how reporting would distinguish differences between devices, networks and locations, and what could be established despite limits on device-level reporting. Software updates were part of the problem, including updates affecting Google devices. A tower can do its job while a particular handset still fails to display the message.

NEMA's own pre-test explanation made room for that variation. AusAlert uses cell broadcast over active 4G and 5G networks. A device's compatibility, software and connection at the time all matter; reception could be immediate, delayed or absent. The national exercise was intended to expose those differences as well as familiarise people with the warning.

The warning was deliberately hard to miss. A Critical Alert makes a compatible device sound and vibrate even in silent or do-not-disturb mode. For July's test, the siren-like sound was described as lasting about ten seconds. That forcefulness is useful when an urgent message must interrupt a day. It also explains why the June letter treated communication about the test as part of the test itself.

A loud signal needs careful preparation

NSW's concerns included road safety, people experiencing domestic violence, communication with culturally diverse communities and procedures for escalating problems or stopping the exercise. These were prospective risks, not reports that the national test had injured anyone.

The subsequent official account deserves equal weight. On 31 July, AusAlert reported preliminary results: no reported public-safety incidents attributed to the test, no material change in observed driver behaviour and no material increase in calls to Triple Zero. Those findings answer a different part of the June concern from the tower percentage. They are encouraging observations, not a guarantee that every future warning will be risk-free.

The letter also questioned provisions in a draft governing Commonwealth use. NSW officials were concerned about the possibility of an alert being issued without consultation with the state or territory controller. That is a concern about a draft, not evidence of an unauthorised alert or a description of the final rules. The practical issue is easy to recognise: the message on a phone should fit the instructions being given by the people managing the emergency.

No overnight changeover

At the July briefing, NEMA's Patrick Hetherington described a phased adoption. States and territories would decide when to use AusAlert, with both it and the existing text-based Emergency Alert available until at least July 2027. From October, jurisdictions would have the option of using one or both. That was the announced transition, not a claim that every jurisdiction had already switched.

The June letter and July results tell a more useful story together than either does alone. Australia demonstrated that it could broadcast a national warning at scale. Its emergency officials were also asking how to judge reception and coordinate the authority behind the message. A percentage describes the first achievement. The phone in someone's hand is where the rest of the work has to arrive.

Correction, 26 October 2026: the earlier summary placed NSW's request after the July national test. The letter was dated 18 June and published on 12 October. This article now distinguishes that pre-test request from the July results; the original URL and publication date are retained.