Mobile networks seem simple from the outside. If there’s a tower nearby, your phone should work. The reality is more complex.
Mobile networks are made up of many parts that all need to work together to keep you connected, especially during busy times or major events.
Behind every call or text, several things must work together:
For internet use, there’s one more: the internet itself.
Issues in any one of these areas can affect how easily you can make a call (or how quickly it connects), as well as the quality of your experience and your data speeds.
For example, when it comes to coverage, the strength of the radio signal between your phone and the nearest tower is key. Things like how far away you are, obstacles such as terrain, trees and buildings, or even how you’re holding your phone, can all have an impact.
Signal bars on phones aren’t a reliable measure of signal strength either. They can vary between devices and don’t follow a consistent standard.
A mobile tower is really a mobile base station. It’s where your phone connects to the network to make a call, browse the internet or stream video. It’s made up of antennas, radio equipment and software that send, receive and process signals.
Your phone connects to the tower with the strongest signal using radio waves known as spectrum. This spectrum is licenced by government regulation and is tightly controlled and shared across many operators at the same time.
In Australia, spectrum is managed by the Australian Communications and Media Authority (ACMA), on behalf of the Government. They set the rules for how spectrum is divided up (which frequencies, where, and how) to avoid interference between signals and maximise the number of end-users it can support.
You can think of spectrum like lanes on a highway. Each operator’s allocation of spectrum (known as bandwidth) works like adding more “lanes” to help traffic move more smoothly, with network rules to guide how users move between them. If there aren’t enough lanes, or the traffic increases, congestion can build, just like on a busy road at peak hours, meaning services may slow down.
Coverage isn’t just about having a tower nearby. It’s about two things working together.
Network equipment (transmitters and receivers, known as “transceivers”) + spectrum (the airwaves) = coverage
Transceivers are the physical equipment on towers that both send and receive signals. Spectrum is the invisible layer those signals travel through.
You need both:
The main reason is that signal is affected by the natural and physical environment it travels through.
Mobile coverage isn’t simply “on” or “off”. It behaves more like a wave, so your experience can change depending on where you are, what’s around you, and what’s between you and the tower.
Signals weaken with distance and obstacles. Being indoors, behind a hill, inside thick-walled buildings or even in a car can reduce signal strength. Your device also plays a role: its age, design and how you’re using it all matter. That’s why two people in the same place can have very different experiences.
Even if you can see a nearby tower, your connection still depends on how the network is balancing three things in real time: available spectrum, how the equipment is configured, and how many people are using the network.
As conditions change (for example, more customers using that tower), performance usually fades rather than dropping out completely. Data-heavy activities like streaming tend to slow first, while calls and texts often keep working because they need less bandwidth (a narrower lane).
This is also why coverage maps and your real-world experience may differ. Coverage maps are a guide only and show predicted coverage, while your actual experience can vary depending on factors like your location, device, surroundings and live network conditions at that moment.
Not all spectrum behaves the same and that directly shapes your experience.
At the same time, towers and their transceivers (the equipment that both sends and receives signals) aren’t one-size-fits-all. They’re carefully designed to meet the needs of their location:
A strong signal from a tower is just one part of the picture. Behind the scenes, that signal also needs to travel back into the wider network. This connection, called backhaul, carries calls and data between the tower and the rest of the network, helping ensure a smooth experience even in busy areas.
There are a few different types of backhaul:
Mobile towers run on AC mains power from the electricity grid. In more remote locations, or where extra resilience is needed, sites may also use hybrid designs that combine grid power with solar and larger battery systems. These setups help reduce reliance on the grid and can extend how long a site keeps operating during power outages.
There isn’t one single answer to how much power a mobile tower uses. Power demand varies depending on how many technologies are running at a site (such as 4G and 5G), the number of radio transceivers and frequency bands in use, and how much traffic the site is carrying at any given time.
What is consistent is that mobile sites are power-hungry assets. They draw kilowatts of electricity, not watts. A typical site running multiple technologies like 4G and 5G can require around 11.5 kilowatts of power: roughly the same as the daily electricity use of around 10 homes, or about 60 family-sized refrigerators running at the same time.
This level of power demand is why access to reliable mains power is so critical. Backup options are important but can only manage the high energy requirements of mobile sites for short durations.
When mains power goes out, mobile sites rely on backup power to stay online. Backup power is about two things: keeping the site running straight away when the grid fails, and how long it can continue operating if the outage lasts.
There’s no single answer to how long it will last, because the energy drain on backup power (from batteries or generators) isn’t fixed but varies with the mobile traffic present. How long a site stays online depends on how busy it is at the time. Events like storms or fires can quickly change demand, sometimes increasing calling and data use as people check in with others, and sometimes reducing it if areas are evacuated.
Duration is also influenced by factors such as battery capacity, whether there’s on-site generation, and practical considerations like space for equipment and safe access during floods or fires.
That’s why resilience programs focus on strengthening backup power at sites where longer endurance can deliver the greatest benefit for local communities, based on an area’s population density and susceptibility to natural disasters, rather than applying a one-size-fits-all approach.
In addition to the installed backup power, we also have field technicians well distributed across regional and metro Australia to install portable generators and refill fuel reserves when it’s safe for them to do so. The ability to access the site is critical to perform these tasks, which is why weather events can prevent access for safety reasons.
Mobile and fixed broadband are designed for different purposes. Fixed broadband (like nbn) is a large, mostly physical connection into a home or business, capable of carrying very high volumes of users and their data. It’s built to support vast numbers of people doing things like streaming, working from home and running businesses, often with multiple users at the same location doing all of this at the same time.
Mobile networks, by comparison, rely on finite radio spectrum that has to be shared between many people in the same area. That means mobile networks can only carry a fraction of the users and total data that fixed networks handle, but they excel at supporting connectivity on the move.
This is where the two really complement each other. Fixed connections do the heavy lifting for high-demand activities at a single location, while mobile helps keep people connected when they’re away from the fixed network, whether that’s on the road, at work, or out in the community.
Mobile technology is powerful, but it has practical limits. The capacity within each antenna is shared, so performance can dip when lots of people are online in the same place at the same time, such as in busy town centres, at major events or during peak commuting hours.
Indoor reliability can also vary depending on the distance from the tower and building materials, which is why mobile operators talk about outdoor coverage rather than indoor.
This is also where Wi-Fi and Wi-Fi Calling can help. When mobile signal is poor indoors, your device can use Wi-Fi for data and, when enabled on a compatible device, Wi-Fi Calling allows calls and texts (including emergency calls) to be made over a fixed internet connection instead of the mobile network.
For people at home or in the workplace, it provides an additional way to connect when indoor mobile coverage is limited.
So while mobile plays a critical role in keeping people connected, it doesn’t replace fixed broadband, it complements it, especially for high-usage homes and businesses. Used together, fixed broadband, mobile networks and features like Wi-Fi Calling help provide more reliable connectivity across different situations.
Satellite to Mobile (also known as Direct to Handset) is a new technology that’s already helping Australians connect in more places. Since launching Satellite Messaging in 2025, our customers have sent millions of text messages using satellite when they’ve been outside traditional mobile coverage. In March 2026 alone, almost 200,000 Australians connected to the service each day, showing just how quickly it’s becoming part of how people get in touch beyond the edge of the network.
But it’s important to understand what it can, and can’t, do today.
Right now, early Satellite to Mobile services are primarily designed for sending and receiving text messages. Connections can be intermittent, you need a clear view of the sky, an eligible plan and a supported device, and it’s not the same as having mobile coverage.
Currently, Satellite Messaging is not designed to be an emergency service, especially as you cannot text Triple Zero directly. So if you’re planning on visiting remote regions, it’s always recommended to plan ahead and take extra precautions in case of an emergency.
What’s important is where this is heading.
As the technology evolves, Satellite to Mobile will play an increasingly important role in connecting regional and remote Australia, supporting not just messaging, but over time enabling voice calls and basic data services.
It’s not about replacing mobile networks. It’s about complementing them.
Looking ahead, Australia’s connectivity will be powered by three technologies working together:
Together, they’ll help ensure Australians can connect in more places, more often, whether they’re in the city, the regions, or beyond the edge of the network.
