Opensignal data casts a light on the Optus digital blackout

On 8th February, parts of Australia went digitally silent. Roughly 220,000 Optus subscribers across Australia found themselves in a digital blackout. No bars, no data — just a persistent "No Service" message on people’s screens. While emergency services remained accessible, standard network connectivity suddenly vanished.

The reason? According to Optus, a software update glitch impaired one of its four national subscriber databases (the Home Location Register, or HLR). The system sent invalid data to customer devices and prevented phones from handshaking (properly authenticating with the network) — even though the radio towers were perfectly operational.

The fix, however, was surprisingly simple: users just needed to restart their devices.

Yet the impact — and what it reveals about modern network resilience — is far more complex.

“Have you tried turning it off and on again?”

Using Opensignal’s Outage Detection tool, we observed a sharp spike in “Emergency Only” and “No Service” cases beginning on 8 February (AEDT time zone — Sydney). The disruption peaked for several hours before steadily easing over the next 24 hours.

As Optus publicly advised users on Monday evening (9th February) to reboot their devices, this pushed a gradual drop in impacted devices after that time. Interestingly, our data shows a sharp decline in affected devices much sooner — hours before the official statement.

This perhaps captured a unique moment of collective human intuition: thousands of Australians saw no mobile service, and instinctively restarted their phones, probably without even realizing there had been a major outage. This “instinctive troubleshooting” might have restored connectivity for a significant portion of the affected subscriber base, hours before Optus issued its official advice.

The Optus network outage showed clear regional variation across Australia. At 4pm AEDT on 8 February — one of the peak outage hours — the share of users without network access ranged from just 2.1% in the Northern Territory to more than 1 in 20 in Western Australia and Tasmania.

Three lessons for the industry

This incident gives us a rare look under the hood of how modern networks really work. And for operators and regulators, a few lessons stand out:

• Core fragility can look just like a coverage failure. Users experienced a "blackout" despite being in areas with full signal strength. As networks become more virtualized and software-defined, the risk of "logic-based" outages — where the hardware is fine but the software is "blind" — becomes a primary threat to reliability. Software glitches causing disruptions have happened in other markets as well, like the one in the U.S. or in the UK.
• Users are part of the recovery story. The sharp drop in impacted devices a few hours after the outage happened — shows that resilience isn’t just about engineering, but also about behavior and communications. When the fix is as simple as restarting a phone, recovery depends on how quickly people realize there’s a problem and what to do about it. In cases like this, fast, and clear communication can be just as important as the technical solution itself.
• Resilience is no longer just about geography. For years, improving network resilience meant expanding reach and filling physical coverage gaps. But this outage shows the picture is more complex and that resilience is now multidimensional. A mobile operator can have nationwide coverage, even backed with satellite connectivity fallback. But if the core network can’t authenticate users, that coverage doesn’t translate into connectivity. 

Australia pushes for universal network access

Network outages are fairly common worldwide — and this particular incident was relatively short-lived and easy for users to resolve. In Australia, however, public sensitivity is heightened after a more critical disruption last year. Last year’s incident completely blocked access to emergency services, resulting in fatalities. This triggered a national call to action.

Australia has become the first country to formally commit its operators to signing Direct to Device (D2D) satellite partnerships as part of a national coverage improvement strategy. The Australian Parliament has passed the Universal Outdoor Mobile Obligations (UOMO) bill requiring major operators to provide basic universal outdoor coverage nationwide from December 2027. The government expects MNOs to meet this target by combining existing mobile networks with D2D technology.

The UOMO strategy is a major step toward closing Australia’s remaining coverage gaps, particularly in remote areas. However, it primarily addresses geography. This latest outage is a reminder that resilience has more than one dimension. Satellites can solve the problem of limited infrastructure in remote locations — but software reliability in the network core is just as critical. Building a truly robust network means strengthening both physical coverage and the technology behind it.

At the same time, greater reliance on D2D partnerships introduces new risks, from integration and interference challenges to cybersecurity concerns. To manage these effectively, the government and operators will need clear regulatory frameworks, diversified D2D suppliers, and strong security safeguards.

As mobile connectivity becomes ever more essential, understanding network resilience is just as important as measuring everyday performance. Opensignal’s independent data provides a transparent view into how networks behave during both normal conditions and moments of disruption — offering valuable context when outages occur and recovery begins. If you are interested in more insights like this, make sure you visit our website. We will also be at MWC 2026, if you would like to set up a meeting with us.

The editorial views expressed in this article are solely those of the author and do not necessarily reflect the views of Opensignal.