Reliable public mobile signal, inside the building.
Indoor mobile coverage ensures that people can use their mobile devices reliably once they step inside a building. It focuses on delivering strong, consistent public 4G and 5G signals indoors, where standard outdoor coverage often fails.
For organisations that depend on mobile connectivity for customers, staff, visitors and contractors, indoor mobile coverage is no longer optional. It is a fundamental part of how buildings function.
Indoor mobile coverage is the process of bringing public mobile network signals directly into a building using dedicated in-building infrastructure.
Modern buildings are not designed with mobile signals in mind. Materials such as steel, reinforced concrete, insulated walls, mechanical infrastructure and energy-efficient glazing can significantly weaken or block outdoor mobile signals. Even locations with strong external coverage often suffer from dead zones once indoors.
Indoor mobile coverage solutions are designed to overcome these challenges and provide a reliable signal throughout the building, not just near windows or entrances.
Mobile devices now sit at the centre of how people interact with organisations and spaces.
Customers expect their phones to work everywhere. Staff rely on mobile tools to communicate, access systems and complete tasks. Contractors, visitors and BYOD users depend on public mobile networks rather than Wi-Fi.
More than this being an inconvenience, though, this also has safety implications. For lone workers or staff in out of sight areas, or even emergency responders whose mobile devices rely on the same public networks once they are inside a building, not having coverage can be dangerous.
When indoor coverage is poor, the impact is felt quietly but consistently:
Because people adapt and work around these issues, the problem is often underestimated, even when it is affecting experience and efficiency every day.
Indoor mobile coverage is delivered using dedicated in-building infrastructure that connects directly to public mobile networks. Depending on the size, layout and usage of the building, this can include:
A single indoor network that supports all major mobile operators, allowing customers and staff to connect regardless of their provider.
Low-power cellular units that provide targeted coverage in specific areas or across entire floors.
Intelligent, operator-approved systems that amplify and distribute existing mobile signal indoors where appropriate.
Coverage that matches how the building is used
Effective indoor mobile coverage is not about boosting signal everywhere equally. It is about delivering reliable connectivity where it matters the most.
This includes:
By designing coverage around real usage patterns, indoor mobile connectivity becomes consistent and predictable, rather than patchy and reactive.
Not a replacement for Wi-Fi or Private 5G
Indoor mobile coverage is designed to support public mobile connectivity. It does not replace Wi-Fi or Private 5G. Instead, it forms part of a layered connectivity approach:
Each layer has a distinct role. Indoor mobile coverage ensures that public mobile services work properly inside the building.
TrellisWorks designs and delivers indoor mobile coverage solutions that work in real buildings, not just on paper.
Our approach focuses on understanding how the building is constructed and used
We select the right in-building technology for the environment and we design solutions that support all major mobile operators
We treat indoor mobile coverage as experience and service infrastructure, not just a technical add-on.
Talk to us about indoor mobile coverage
If mobile signals are inconsistent inside your building and you want a clear, practical way to improve things, speak to one of our team. We’ll help you understand what’s possible and design an indoor mobile coverage solution that supports the people and services that rely on it.
Building the IT network and infrastructure
Building the IT network and infrastructure
