Poor mobile reception is one of the most persistent complaints in modern apartment buildings across Australia. Residents make calls that drop mid-sentence, send texts that sit undelivered for minutes, and struggle to load a webpage from their own living room — all while paying for a mobile plan that works perfectly the moment they step outside. For strata managers and building committees, it is a headache that invites constant complaints and, increasingly, genuine safety concerns. Understanding why the problem exists is the first step toward choosing a solution that actually works.
Why Apartment Buildings Kill Mobile Signal
The short answer is that modern construction materials are extraordinarily effective at blocking radio waves — which is precisely what 4G and 5G mobile signals are.
Reinforced concrete is the primary culprit. The dense aggregate and embedded steel rebar absorb and scatter radio frequency energy, meaning a signal that arrives at the building's exterior wall at full strength may lose 20 to 30 dB simply passing through the structure. In practical terms, that is enough to take a device from full bars outdoors to no service inside. The problem compounds with every additional wall a signal must penetrate — an internal apartment on the third floor, for instance, may sit behind an exterior wall, a common corridor wall, and a fire-rated partition before the signal reaches a resident's handset.
Energy-efficient glazing adds another layer of attenuation. Low-emissivity (low-e) glass, which is standard in most contemporary residential developments, contains a metallic coating designed to reflect heat. That same coating reflects radio waves. Buildings marketed on their green credentials or thermal performance are often the worst performers for mobile signal.
Steel-framed buildings and those with aluminium curtain wall facades create similar effects. In some configurations, particularly where metal cladding wraps around structural columns, the exterior of the building can act as a partial Faraday cage — a continuous conductive enclosure that prevents electromagnetic fields from entering or leaving.
Specific areas within any apartment building tend to be especially problematic. Basement car parks sit below grade and beneath a concrete slab, effectively surrounded on all sides by attenuating material. Lift shafts are true Faraday cages — metal-lined enclosures with no path for a radio signal to enter. Internal corridors, particularly those in the centre of a floor plate with no direct line of sight to an exterior wall, frequently have the weakest signal of any occupied space in the building.
Carrier and Device Variation Makes Diagnosis Harder
Mobile reception is not uniform across residents even within the same building. A resident on Telstra may have acceptable coverage while their neighbour on Optus does not, because each carrier operates on different frequency bands and their network infrastructure — towers, small cells, and coverage patterns — varies by suburb and even by street. Telstra's 700 MHz Band 28, for example, penetrates building materials better than the higher-frequency bands that carry much of Optus and TPG's traffic, which is why Telstra customers in fringe or indoor locations often report better results.
Device hardware matters too. Flagship smartphones from the past two to three years typically include more capable antenna systems and modem chipsets than budget handsets, which can mean a five-bar difference in displayed signal between devices sitting side by side. A resident complaining about poor reception on an older phone may genuinely be experiencing a problem that a newer device handles adequately.
This variation means a strata manager who receives inconsistent complaints — some residents affected, others not — is not necessarily dealing with an unfixable problem. It does, however, make systematic diagnosis more important than anecdotal reporting.
Why Poor Coverage Is Now a Safety Issue
Until recently, poor mobile signal inside a building was primarily an inconvenience. The 3G network shutdown across Australia — completed by all major carriers by 2024 — changed the stakes significantly.
Voice over LTE (VoLTE) is now the default mechanism for mobile voice calls on all Australian networks. VoLTE requires a 4G or 5G data connection, not just a voice channel. In areas where a device can no longer fall back to 3G for voice, a weak 4G signal that is sufficient for occasional text messages may not sustain a voice call reliably. The direct implication for apartment buildings is that residents in coverage-weak areas may be unable to complete a 000 emergency call from inside their unit.
Wi-Fi calling partially addresses this risk — a device connected to a Wi-Fi network can route voice calls over the internet, bypassing the mobile network entirely for voice. But Wi-Fi calling only works if the building's Wi-Fi infrastructure is adequate, and in many older strata buildings, it simply is not.
Solution One: Managed Wi-Fi and Wi-Fi Calling
For the majority of apartment buildings, particularly those where the issue is moderate signal degradation rather than total absence of coverage, a properly designed managed Wi-Fi network is the most cost-effective and fastest-to-deploy solution available.
Telstra, Optus, and Vodafone (TPG) all support Wi-Fi calling on modern iOS and Android handsets. When a resident's device detects a strong Wi-Fi connection, it can automatically route voice calls and SMS over that connection rather than through the mobile network. From the resident's perspective, calls work normally. The mobile number rings. Emergency calls to 000 route correctly. The only requirement is a reliable Wi-Fi signal throughout the building.
The qualification is important: a consumer-grade router or a single access point in the lobby will not achieve this. Wi-Fi calling for voice-grade communication requires commercial-grade access points deployed at sufficient density to provide consistent coverage across all occupied areas, including corridors, car parks, and lift lobbies. The network must support Quality of Service (QoS) configuration to prioritise voice traffic over bulk data, preventing a resident downloading a film from degrading the call quality of their neighbour. VLAN segmentation separates resident traffic from building management systems and ensures the network meets the security standards appropriate for shared infrastructure.
Pickle's apartment building technology solutions include managed Wi-Fi design and deployment specifically configured for strata environments, with the carrier-grade QoS and coverage density that consumer hardware cannot provide. For strata managers evaluating options, this is typically the right starting point before considering more complex infrastructure.
It is also worth noting what managed Wi-Fi does not do. It does not improve the actual mobile signal inside the building. A resident who relies on their mobile data plan for internet rather than connecting to building Wi-Fi will see no improvement. The solution addresses voice calls and messaging through the Wi-Fi calling path; it does not improve mobile broadband performance for residents who remain on cellular data.
Solution Two: Distributed Antenna System (DAS)
A Distributed Antenna System is the only solution that genuinely improves native mobile signal throughout a building. Rather than replacing the mobile network path with Wi-Fi, DAS extends the actual carrier signal into the building interior through a network of small antennas connected to a central head-end unit.
In a DAS deployment, a signal source — either a connection to the carrier's network via fibre or a donor antenna mounted on the rooftop to capture an outdoor signal — feeds a centralised head-end. From there, the signal is distributed through coaxial cable or fibre to multiple small antennas positioned throughout the building. Residents see improved signal bars on their devices without any configuration changes, and the improvement applies equally to voice, SMS, and mobile data.
The limitations of DAS are significant. Carrier involvement is required; a DAS cannot amplify mobile signals without formal approval and, in most cases, active participation from the carrier whose signal is being extended. That involvement adds cost, complexity, and lead time that is measured in months, not weeks. The capital cost of a full DAS deployment in a mid-rise apartment building typically runs into the tens of thousands of dollars at minimum, and large towers may require substantially more.
DAS is most appropriate for new developments where it can be designed into the building's infrastructure from the outset, or for very large towers where the resident population justifies the investment. Carriers are also more likely to engage with DAS proposals in buildings where they have a commercial interest in improving coverage — a large building in a major urban centre where many of their subscribers live.
For strata committees in existing buildings seeking a cost-effective fix, DAS is usually not the right first step. The practical advice from Pickle's team, consistent with what we outline in our strata management communications guide, is to assess whether managed Wi-Fi with Wi-Fi calling resolves the majority of complaints before commissioning a DAS feasibility study.
What About Mobile Signal Boosters?
Signal boosters or repeaters — devices that receive an external mobile signal and rebroadcast it inside the building — are frequently suggested in strata forums and online communities as a simple DIY solution. The reality is more complicated.
In Australia, mobile signal boosters are regulated by the Australian Communications and Media Authority (ACMA). Operating an unapproved booster is a criminal offence under the Radiocommunications Act, with significant penalties. The only legal boosters are those that have been approved by ACMA and, critically, by the relevant carrier. Most carriers do not approve consumer-grade boosters, and unapproved devices can interfere with legitimate carrier networks, potentially degrading service for an entire suburb rather than improving it for one building.
Approved carrier-grade boosters exist, but they cover a limited area, are not designed for multi-carrier operation, and require professional installation. They are not a practical building-wide solution for a strata building with dozens or hundreds of residents across multiple carriers. Strata committees should be cautious of any contractor proposing to install signal boosters without demonstrating current ACMA compliance documentation and written carrier approval.
Comparing Your Options
| Feature | Managed Wi-Fi + Wi-Fi Calling | Distributed Antenna System (DAS) |
|---|---|---|
| Improves native mobile signal | No | Yes |
| Improves voice calls indoors | Yes (via Wi-Fi calling) | Yes |
| Improves mobile data speeds | No | Yes |
| Carrier approval required | No | Yes |
| Typical deployment timeline | 4–12 weeks | 6–18 months |
| Relative cost (existing building) | Moderate | High to very high |
| Suitable for existing strata buildings | Yes | Complex; better suited to new builds |
| Works for all carriers simultaneously | Yes (carrier-agnostic Wi-Fi) | Multi-carrier DAS is possible but adds cost |
| Resident configuration required | Minimal (Wi-Fi calling enabled on device) | None |
Practical Steps for Strata Managers
If your building is receiving consistent complaints about mobile coverage, a structured approach is more useful than reacting to individual incidents.
Begin with a walk of the building during business hours, visiting the basement, ground floor lobby, internal corridors on a mid-level floor, the lift interior, and a representative sample of upper and lower floor units. Note where your own device loses signal bars or drops calls. This anecdotal survey quickly identifies the worst-performing areas and helps frame the scope of any professional assessment.
Check what Wi-Fi infrastructure currently exists in common areas. If the building already has access points in corridors and common spaces, the question is whether they are configured for voice QoS and whether their coverage is continuous enough to support Wi-Fi calling. Many buildings have legacy Wi-Fi installations that were designed for minimal internet access rather than voice-grade performance.
For buildings where the walk-survey identifies significant dead zones and existing Wi-Fi is inadequate, commissioning a professional site assessment is the appropriate next step. A proper assessment includes signal measurement, coverage mapping, and a recommendation that distinguishes between what managed Wi-Fi can resolve and what may require carrier engagement.
For large developments or new apartment towers still in the design phase, the technology infrastructure decisions made at the planning stage have a long-term impact on resident experience. Our article on technology infrastructure for apartment developments covers how to embed the right foundations before the building is complete.
Security and network design are also worth considering holistically — a building Wi-Fi network that supports voice calls must also be designed to protect resident data. Our guide on secure network design for apartment buildings covers the principles that should inform any strata Wi-Fi deployment.
Frequently Asked Questions
Q: Will Wi-Fi calling work for emergency calls to 000?
A: Yes. When Wi-Fi calling is enabled on a compatible device and the device is connected to a Wi-Fi network, 000 calls can be completed over that connection. Australian carriers are required to support emergency calling over Wi-Fi calling where the feature is offered. However, the building's Wi-Fi network must be available and the device must have Wi-Fi calling enabled in its settings — it is not automatic on all handsets.
Q: Do all residents need to do anything to use Wi-Fi calling?
A: Residents need to connect to the building's Wi-Fi network and enable Wi-Fi calling in their phone's settings. On most modern iPhones and Android devices, this is a simple toggle. The carrier must also support Wi-Fi calling — Telstra, Optus, and Vodafone/TPG all do on compatible plans and handsets. Residents on older devices or MVNOs with restricted features may not be able to use it.
Q: Can a strata committee legally install a signal booster to fix mobile reception?
A: Only if the booster is ACMA-approved and has written approval from the relevant carrier or carriers. Unapproved boosters are illegal under Australian radiocommunications law and can interfere with carrier networks. In practice, carrier-approved boosters cover a limited area and are not designed as a multi-carrier, building-wide solution. Strata committees should seek professional advice rather than purchasing commercial boosters marketed online.
Q: Our building is new construction — why is reception still poor?
A: New construction is often worse for mobile coverage than older buildings precisely because modern materials are so effective at insulation. Energy-efficient glazing with metallic coatings, dense concrete, and continuous metal cladding all attenuate radio signals more severely than older brick or single-pane glass construction. If your building was recently completed, this is the right time to raise coverage infrastructure with the developer before the defects liability period closes.
Q: How much does a building-wide Wi-Fi solution cost for a typical apartment block?
A: Costs vary significantly based on building size, existing cabling infrastructure, number of access points required, and whether the network needs to integrate with building management systems. A professional site assessment will produce a scoped estimate. As a general orientation, a managed Wi-Fi deployment for a medium-sized apartment building — sufficient to support voice-grade coverage throughout — is typically a fraction of the cost of a DAS installation and can be completed in weeks rather than months.
Speak to Pickle About Mobile Coverage in Your Building
Pickle works with strata managers, building committees, and property developers across Australia to design and deploy communication infrastructure that solves real problems — including mobile coverage. Whether you need a managed Wi-Fi assessment, a DAS feasibility study, or a full technology audit, our team can provide practical advice based on your specific building type and resident mix.
Call us on 1300 688 588, email [email protected], or visit our apartment building technology solutions page to learn more and request a site assessment.