Nextivity Cel-Fi Elite Partner

Every bar
every room
every network

Zonegen design and professionally install Ofcom-approved mobile signal boosters for residential and commercial properties throughout London and the South East — delivering reliable 4G & 5G coverage across all major UK networks.

EE VodafoneThree O2 4G 5G
8+
Years delivering
signal solutions
Signal improvement
achievable
100%
Ofcom
compliant

Great signal, guaranteed.

Modern buildings are designed to be signal killers — thick concrete, glazed facades, basement car parks, underground spaces. Off-the-shelf boosters won't fix it, and some are outright illegal. Zonegen installs only Ofcom-compliant products, permanently eliminating dead zones — typically completed within a day for straightforward sites, with larger buildings handled over an agreed timescale.

Fully Ofcom-compliant installations, guaranteed

Zonegen only installs Ofcom-compliant signal boosters, fully endorsed by EE, VodafoneThree, and O2. Every system we supply meets Ofcom's technical requirements — no grey-market hardware, no compliance risk.

Professionally installed to suit your timescale

Our accredited engineers survey, design, and install your solution from start to finish. No DIY guesswork, no plug-in-and-hope products — we don't leave until your signal is fully confirmed and working.

Every major UK network, one installation

EE, VodafoneThree, and O2 — all boosted simultaneously with a single system. No carrier-specific hardware, no exclusions for your team or guests, no second visit.

UK-based support, not an overseas call centre

Eight years of specialist signal expertise and real people who answer the phone. We're a dedicated signal company — not a generalist company that does signal on the side.

100+ Buildings connected
8+ Years of signal expertise
4× Signal strength boost
All Major UK networks covered

Signal solutions for every environment

From corporate offices to care homes, construction sites to car parks — Zonegen delivers Ofcom-approved signal solutions across London and the South East.

Modern commercial office interior
Commercial

Offices & Commercial Properties

Poor mobile signal costs businesses time and money. Zonegen eliminates dead zones throughout offices, multi-floor commercial buildings and managed workspaces — keeping every employee, visitor and system reliably connected.

  • Full coverage across all floors, meeting rooms and reception areas
  • Supports hybrid working and mobile-dependent business systems
  • All UK networks — EE, VodafoneThree, O2 — on a single installation
  • Ofcom-approved, zero interference to building infrastructure
  • Free consultation before any work begins
Modern home interior living space
Residential

Home & Small Office

Thick walls, basement rooms and rural locations all block mobile signal. Our residential solutions deliver reliable 4G and 5G to every room in your home — including areas that have never had proper coverage.

  • Covers every room including basements and loft conversions
  • Works with all major UK networks simultaneously
  • Compact, discreet installation — minimal disruption to your home
  • Ideal for home workers and families relying on mobile data
  • Professionally installed by accredited engineers — timescale agreed at survey
Hospital corridor and medical facility
Healthcare

Hospitals & Medical Facilities

Reliable mobile connectivity is essential in healthcare — for staff communication, patient safety systems and visitor access. Nextivity Cel-Fi systems are specifically engineered to operate safely alongside sensitive medical equipment without causing interference.

  • Safe operation alongside medical monitoring equipment
  • Full coverage in wards, theatres, corridors and car parks
  • Supports staff communications and mobile-enabled clinical systems
  • Installed with minimal disruption to live hospital environments
  • Fully Ofcom-approved — no risk to medical device compliance
Large industrial warehouse interior
Industrial

Warehouses, Factories & Distribution Centres

Large steel and concrete structures are notorious signal blackspots. Zonegen provides complete in-building coverage for warehouses, factories and distribution centres — ensuring voice, data and IoT devices stay connected across every square metre of your operation.

  • Full coverage in steel-framed and concrete industrial buildings
  • Supports handheld scanners, tablets and logistics management systems
  • Scalable multi-antenna distribution for any floorplate size
  • Reliable connectivity for warehouse management and WHSE systems
  • Free consultation — we size the solution to your building
Hotel lobby and hospitality venue
Hospitality

Hotels, Restaurants & Venues

Guests and diners expect seamless mobile connectivity as standard. Poor signal affects guest satisfaction scores, card payment systems and digital services. Zonegen delivers reliable in-building signal across hotels, restaurants, pubs and entertainment venues.

  • Complete coverage across guest rooms, lobbies, bars and event spaces
  • Supports contactless payment systems and hospitality POS
  • Improves guest reviews and repeat bookings
  • Discreet installation — minimal impact on interior aesthetics
  • Works with all UK networks on a single system
Retail store shopping environment
Retail

Retail Stores & Shopping Centres

Mobile signal drives retail revenue — from contactless payments and loyalty apps to staff communications and EPOS systems. Dead zones in-store create friction at the point of sale. Zonegen ensures seamless connectivity throughout retail environments of any size.

  • Reliable signal for contactless payments and mobile EPOS
  • Full coverage in stockrooms, fitting rooms and basement levels
  • Supports staff handheld devices and inventory management
  • Works across large retail parks and multi-unit shopping centres
  • No disruption to trading during installation
School and university education building
Education

Schools, Colleges & Universities

Modern education relies on mobile connectivity — from student devices and remote learning platforms to staff communications across sprawling campuses. Zonegen delivers consistent signal across lecture theatres, labs, sports halls and accommodation blocks.

  • Campus-wide coverage including outdoor walkways and car parks
  • Supports student devices, e-learning platforms and admin systems
  • Scalable from single schools to multi-site universities
  • Ofcom-approved — compliant with safeguarding requirements
  • Installations timed around term schedules to minimise disruption
Multi-storey car park
Parking & Transport

Car Parks, Walkways & EV Charging

Underground and multi-storey car parks are among the worst signal environments in any building. With EV charging now requiring app-based payment and authentication, reliable mobile connectivity in car parks has become essential — not optional.

  • Reliable signal in basement and underground car parks
  • Supports EV charging app authentication and contactless payment
  • Coverage in walkways, stairwells and lift shafts
  • Works across all UK networks simultaneously
  • Enhances visitor safety with reliable emergency call capability
Care home resident with carer
Social Care

Care Homes & Retirement Properties

For care home residents and staff, mobile connectivity is a lifeline. Whether it is a resident calling family, a carer using a mobile-enabled monitoring system, or emergency call functionality, reliable signal across every room is critical.

  • Consistent signal across all resident rooms and communal spaces
  • Supports mobile-enabled fall detection and emergency call systems
  • Keeps residents connected with family and friends
  • Enables staff to use mobile care management platforms
  • Sensitive installation — minimising disruption to residents
Emergency services fire station
Public Safety

Emergency Services & Public Safety

First responders and public safety teams require uninterrupted mobile communications in any environment. Zonegen provides the in-building signal infrastructure that supports reliable connectivity in challenging buildings where signal failure is never acceptable.

  • Reliable in-building signal for police, fire and ambulance communications
  • Coverage in challenging environments — basements, stairwells, vaults
  • Supports both 4G and 5G public safety communications
  • Fully compliant with Ofcom licensing requirements
  • Designed and installed to the most demanding specification
Construction site with workers
Construction

Construction Sites & Developments

Construction sites need reliable mobile connectivity from day one. Whether it is coordinating teams across a large site, running mobile-dependent project management tools, or maintaining safety communications, Zonegen ensures signal is there from the start.

  • Temporary and permanent signal solutions for active sites
  • Covers large outdoor sites and partially built structures
  • Supports site management apps, BIM tools and safety comms
  • Rapid deployment — survey to installation within days
  • Scalable as the build progresses
Data centre server room
Technology

Data Centres & Enterprise

Data centres present unique signal challenges — dense metallic infrastructure, shielded server rooms and strict RF environment requirements. Zonegen provides carefully designed in-building solutions that deliver reliable cellular connectivity without compromising facility integrity.

  • Signal delivery in shielded and metal-dense environments
  • Supports engineer mobile devices and remote monitoring systems
  • Compliant with strict RF environment requirements
  • Works alongside existing network and security infrastructure
  • Engineered to your facility management team specification
IoT connected technology devices
IoT & Connectivity

IoT & Connected Devices

The Internet of Things relies on consistent, reliable cellular connectivity. Whether it is smart building sensors, remote asset tracking, environmental monitoring or connected security systems, Zonegen ensures your IoT infrastructure stays online — even deep inside complex buildings.

  • Reliable cellular for 4G and 5G IoT devices in any environment
  • Supports smart building systems, BMS and environmental sensors
  • Enables remote asset monitoring across large or complex sites
  • Eliminates cellular dead zones that cause IoT dropouts
  • Works with all major UK network operators

Signal experts who genuinely care
about getting it right.

We are a family-run business — not a large corporate. Every installation matters to us personally, and we take real pride in solving signal problems properly, at a price that fits your budget.

The Royal Opera House WarnerMedia Taylor Wimpey Sony Music Marriott Hotels Pure Offices

Family-Run — We Care About Every Job

Zonegen is a family business. You will always speak with the same people, get honest advice, and be treated as a customer — not a contract. We take personal pride in every installation we complete, from the smallest home to the largest commercial building.

8+ Years of Specialist Signal Expertise

Since 2016, we have been solving signal problems in all types of buildings across London and the South East — listed buildings, new developments, hospitals, warehouses, and everything in between. There is very little we have not seen and fixed.

Best Results at an Affordable Price

We do not believe great signal should cost a fortune. Our quotes are transparent, our installations are thorough, and we will never recommend equipment you do not need. Exceptional results and honest value — that is the Zonegen standard.

Unlock superior signal with Cel-Fi by Nextivity

Cel-Fi by Nextivity is the world's most advanced smart signal booster — a fully Ofcom-compliant system for use in the UK. Here is what makes it different.

Superior Cellular Coverage

Cel-Fi improves voice and data coverage across 4G and 5G networks — indoors and in buildings where signal is typically blocked or weak. Whether it is a thick-walled office, a basement car park or a rural home, Cel-Fi delivers seamless, reliable mobile signal.

Innovative Smart Technology

Powered by Nextivity's Intelliboost® chipset, Cel-Fi is the only signal booster that actively manages its output to protect the network. It is not a passive repeater — it is an intelligent system that automatically adjusts to deliver maximum performance without causing interference.

Custom Solutions for Every Space

From small offices to large commercial buildings, Cel-Fi scales to any environment. Zonegen carries out a free consultation to design the right solution for your building.

  • Indoor Coverage — dramatically improves connectivity even where outdoor signal is poor
  • Scalable Systems — from a single unit for a home to a multi-antenna distribution system for an entire building

Why Cel-Fi by Nextivity?

Unlike outdated analogue boosters, Cel-Fi provides up to 1000 times stronger mobile signal, using CAT 6 cabling and Power over Ethernet for zero signal loss. It is a fully network-safe and Ofcom-compliant solution — meaning no risk, no paperwork, no compromise.

Curious how Cel-Fi can improve your building's mobile coverage? Contact us today to discover the right solution.

Book a free consultation

The right solution for your building

From consultation to survey to installation, we manage the entire process. No overselling, no guesswork — just the right system for your building, expertly fitted and fully tested.

Residential & Small Office

Domestic Signal Solutions

Our residential solutions are compact, self-contained and professionally installed. Designed for homes and small offices, they deliver significantly improved signal to every room — including areas previously suffering from weak or no coverage.

  • All major UK networks supported
  • 4G LTE & 5G compatible
  • Licence-exempt — fully Ofcom approved
  • No disruption to your mobile network
  • Professional installation by Zonegen engineers
Commercial & Enterprise

Commercial Signal Solutions

Our commercial solutions are engineered for larger buildings — warehouses, hospitals, multi-floor offices and everything in between. Greater power, wider coverage and full network compatibility make them the go-to choice for demanding environments.

  • All UK networks — EE, VodafoneThree, O2
  • Scalable to large and complex floorplates
  • 4G & 5G ready
  • Multi-antenna distribution available
  • Free consultation included

Why voice & data connectivity is critical in the age of AI and robotics

Artificial intelligence and autonomous systems are transforming every industry — but they only work when the underlying signal infrastructure is rock solid. Poor mobile connectivity is no longer just an inconvenience. It is a barrier to the future.

100ms Max latency tolerance for real-time AI systems
5G The backbone of autonomous operations

AI systems demand real-time data

Machine learning models, predictive analytics and autonomous decision engines require constant, low-latency data flows. A signal dropout of even a few seconds can halt an AI-driven production line, misroute a delivery robot, or trigger a costly system failure. Reliable in-building 4G and 5G is the foundation everything else rests on.

Robots need voice & data to collaborate

Modern robotic systems — from warehouse AMRs to surgical assistants — communicate continuously with cloud platforms, central controllers and human operators. Voice-grade connectivity ensures safety commands are received instantly. Data connectivity keeps autonomous systems updated with live environment maps, task queues and performance telemetry.

IoT & smart building infrastructure

AI-powered buildings — with smart HVAC, occupancy sensing, security cameras and energy management — depend on thousands of connected sensors sending data around the clock. Gaps in mobile signal create blind spots that undermine the intelligence of the entire system. Consistent in-building coverage is what makes smart infrastructure actually smart.

Business continuity in a fast-moving world

As AI adoption accelerates, organisations that invest in robust connectivity infrastructure gain a decisive competitive edge. Those that don't face mounting operational risk. Zonegen's Ofcom-approved Cel-Fi solutions future-proof your building — ensuring your voice and data infrastructure keeps pace with an AI-driven world, not holds it back.

The world is changing fast. AI, robotics, automation and smart infrastructure are no longer emerging trends — they are operational realities reshaping every sector. The organisations deploying these technologies in London and the South East need one thing above all else: a signal environment that never lets them down. That is what Zonegen delivers.

Talk to our team

The Vodafone & Three merger — what it means for your building

In May 2025, Vodafone UK and Three UK officially merged to create VodafoneThree — the UK's largest mobile network operator with over 27 million customers. For businesses and building owners, the implications are significant.

27M+ Combined customers — UK's largest mobile network
£11bn Investment committed over 10 years in 5G infrastructure
99% UK population to be covered by a new 5G Standalone network
600+ Sites already upgraded with shared MOCN technology

More spectrum, stronger in-building signal

The combined network brings together both operators' spectrum holdings and infrastructure — meaning wider frequency coverage across 4G and 5G bands. More spectrum diversity directly improves penetration into buildings, basements and dense urban environments where signal has historically struggled to reach.

MOCN technology — automatic best-network switching

VodafoneThree is rolling out Multi-Operator Core Network (MOCN) technology, allowing customers to automatically connect to whichever signal point is strongest. VodafoneThree customers now share one pooled network — and already see improved coverage and speeds across hundreds of sites.

5G Standalone — a fundamentally better network

The £11 billion investment will fund a true 5G Standalone (SA) network — not just 5G layered on 4G infrastructure, but a dedicated next-generation core. This enables ultra-low latency, greater capacity and the advanced network slicing capabilities that power-hungry businesses and smart buildings will require in the years ahead.

Why in-building boosters matter more than ever

Even as the outdoor network improves dramatically, buildings themselves remain a significant barrier to signal. Thick concrete, steel frames, energy-efficient glazing and underground spaces all attenuate signal regardless of how strong it is outside. A Cel-Fi booster from Zonegen bridges that gap — bringing the benefits of VodafoneThree's investment inside your walls.

Zonegen supports all major UK networks — including VodafoneThree. Whether your occupants are on EE, O2, VodafoneThree or any of the associated MVNOs such as VOXI, SMARTY or Talkmobile, a single Cel-Fi installation covers them all simultaneously. As VodafoneThree's combined network evolves, Zonegen's solutions evolve with it.

In-building boosters for private mobile networks

Beyond public mobile networks, Zonegen installs Cel-Fi signal boosting equipment for organisations operating their own private cellular networks — all within Ofcom's licence-exempt framework.

Fully Ofcom Licence-Exempt

Nextivity Cel-Fi systems are approved under Ofcom's licence-exempt framework, meaning no spectrum licence application, no regulatory delay and no compliance risk. Zonegen handles everything from survey to sign-off.

Network-Isolated Signal Amplification

Private network boosters amplify signal exclusively within the host system — there is zero risk of interference with adjacent public networks or neighbouring operators. The Cel-Fi architecture is built specifically to prevent cross-network bleed.

Designed for Complex, Controlled Environments

Private networks are common in logistics hubs, manufacturing facilities, airports, hospitals and large campuses where operational control and data security are paramount. Zonegen designs and installs systems that deliver full indoor coverage without compromising the integrity of your private infrastructure.

Free Private Network Consultation

Every private network installation begins with a thorough consultation. We assess your spectrum, building characteristics and operational requirements before recommending and sizing the right Cel-Fi system for your environment.

Private 4G and 5G networks — also known as non-public networks (NPNs) — are increasingly deployed by large organisations seeking dedicated, secure and highly reliable mobile connectivity for their operations. Unlike shared public networks, private networks offer guaranteed capacity, ultra-low latency and complete data sovereignty.

But even the most well-engineered private network faces the same challenge as any mobile system: buildings block signal. Thick walls, steel infrastructure, shielded server rooms and multi-floor layouts all degrade coverage — leaving pockets of the facility without reliable connectivity and undermining the value of the private network investment.

Zonegen solves this with Nextivity Cel-Fi boosters, configured specifically for private network frequency bands and operating parameters. The result is consistent, reliable coverage throughout your building — with the security, isolation and performance a private network demands.

4G & 5G NPN Compatible Ofcom Licence-Exempt Network-Safe & Isolated Free Consultation Warehouses & Factories Hospitals & Campuses Airports & Logistics Hubs

Ofcom Licence-Exempt Framework

Nextivity Cel-Fi signal boosters are fully approved by Ofcom under the licence-exempt regime in the UK. This means Zonegen can install boosters for private networks without the need for a spectrum licence application — removing regulatory complexity and accelerating deployment timelines.

The Cel-Fi system's Intelliboost® chipset ensures it never transmits outside its approved parameters and never causes interference to adjacent networks — satisfying Ofcom's technical requirements by design, not configuration.

Discuss your private network

Brands that trust Zonegen signal

We have delivered signal solutions for some of the UK's most recognisable organisations — from luxury hotels to government offices.

The Royal Opera House WarnerMedia Taylor Wimpey Sony Music Marriott Hotels Pure Offices Turner Broadcasting Government Legal Department

"Thank you Zonegen for your hard work and professionalism. Great job — really enjoyed working with you all."

Steve France — Senior Engineer for Windows & Applications, WarnerMedia (Turner Broadcasting)

Common questions about mobile signal boosters

Everything you need to know before booking your free consultation.

Are Nextivity Cel-Fi signal boosters legal in the UK?

Yes. Nextivity Cel-Fi smart signal boosters are fully Ofcom-approved and licence-exempt. Unlike traditional amplifiers, they use intelligent, network-safe technology and do not cause interference to mobile networks.

Which mobile networks are supported?

Zonegen's Cel-Fi solutions support all major UK mobile networks including EE, VodafoneThree, and O2, covering both 4G LTE and 5G signals across all frequency bands.

How long does an installation take?

Installation time depends on the size and complexity of the building. A straightforward job typically takes a day, while larger or more complex sites may take longer. Zonegen always carries out a free survey and free consultation before any work begins, so you know exactly what to expect.

Do I need planning permission?

No planning permission is required for Nextivity Cel-Fi signal boosters. They are classified as licence-exempt by Ofcom, and Zonegen's trained engineers handle all technical aspects of the installation.

What signal booster solutions does Zonegen offer?

Zonegen supply and install a range of Nextivity Cel-Fi signal boosters for domestic and commercial environments. We will recommend the right solution after your free consultation.

Can you boost signal in a basement or underground car park?

Yes. We install Nextivity Cel-Fi systems in basements, underground car parks, and buildings with thick concrete walls. A donor antenna is placed where signal is available and the booster distributes it throughout the shielded area.

Does Zonegen offer ongoing monitoring for signal booster systems?

Yes. Our monitoring subscription service includes remote system health checks, instant alerts if your signal drops or the system goes offline, regular performance reports, and proactive engineer online fault detection — all delivered by the same team who installed your system.

Is Zonegen a family-run business?

Yes. Zonegen is a family-run specialist signal company. You will always deal with the same people — from your first consultation through to installation and ongoing support. We hold Elite Partner status with Nextivity, the highest accreditation available.

Get Started

Ready to eliminate your signal dead zones?

Book a free, no-obligation consultation. One of our engineers will discuss your requirements, assess your building and recommend the most cost-effective solution — with no hard sell.

020 3985 7666 info@zonegen.co.uk