Cellular Signal Boosters

Cel-Fi by Nextivity – Intelligent Cellular Coverage Solutions

Our Cel-Fi by Nextivity products bring reliable cellular signals from all major network operators to every corner of your facility. From convenience stores, fuel stations, and quick-serve restaurants to large warehouses and distribution centers, we deliver hassle-free coverage solutions that drive in-store sales, speed transactions, and support seamless operations.

At the heart of every Cel-Fi system is Nextivity’s proprietary IntelliBoost® chip — an advanced smart-signal processor that delivers industry-leading amplification with built-in intelligence. Unlike traditional “dumb” repeaters that can interfere with carrier networks, IntelliBoost continuously analyzes the cellular environment, optimizing gain in real time to ensure maximum performance without causing harmful noise or tower interference. This makes Cel-Fi the safest, most efficient, and carrier-approved booster technology available today.

The Cel-Fi GO G43 covers smaller spaces and can be installed in a single day with minimal business disruption. For larger environments, or for enterprises looking for scalable coverage that supports private networking and IoT sensor integration, the Cel-Fi QUATRA 4000 product line offers unmatched flexibility and performance.

All systems are remotely managed and monitored, providing easy maintenance and optimization with no burden on internal IT teams.

Unique to HCI is our ability to deliver large-scale, multi-site deployments across geographically diverse organizations, including multinational operations. Whether you have one location or thousands, our experienced network of certified installers is ready to fix your cellular issues and build a high-performance network infrastructure that empowers you to Do More with DAS.

Frequently Asked Questions: Cellular Dead Zones

How beneficial is it to retail establishments to have coverage?
A retail study (Path Intelligence, cited in multiple telecom/retail analyses) found: A 1% increase in dwell time leads to ~1.3% increase in spending that can lead toa 2-7% revenue lift.

What exactly is a cellular dead zone?
A cellular dead zone is any area where your phone can't maintain a usable connection to a cell tower — resulting in dropped calls, failed texts, or no data at all. Dead zones aren't limited to rural areas; they can occur inside retail stores, large office buildings, parking garages, tunnels, and even specific rooms within your home

What causes dead zones inside buildings?
The most common culprits are the building materials themselves. Brick, concrete, steel framing, and even LEED-certified "green" windows are notorious for blocking or weakening cellular signals before they reach your device. Distance from the nearest cell tower and local terrain — hills, dense trees, or other tall structures — can make the problem worse.

How do I know if I have a dead zone or just a weak signal?
The bars on your phone aren't always reliable. For a more accurate read, measure your signal in decibels (dBm) rather than bars. Android users can find this under Settings, while iPhone users can dial 3001#12345# to enter field test mode and view their dBm reading. Ideally, you want an outdoor reading between -50 and -80 dBm; anything below -110 dBm is essentially a dead spot

Will a signal booster work if I have no bars at all?
It depends on whether any signal exists outside your building. Signal boosters amplify existing cellular signal — they can't create it from nothing. That said, boosters have stronger antennas than phones, so even if your phone shows zero bars, a booster may still be able to detect and amplify a faint signal your phone can't pick up on its own. An HCI site assessment is the most reliable way to find out.

What's the difference between a signal booster and a DAS system — and which do I need?
Distributed Antenna Systems (DAS) capture outside signals and can amplify them significantly across large spaces. Traditional DAS deployments tend to be expensive and complex. Smart signal boosters like Cel-Fi are designed as a more accessible alternative — self-configuring systems that deliver high gain without the full cost and infrastructure of a DAS build-out. Smaller properties typically do well with a consumer-grade booster, while larger commercial or industrial sites may benefit from an enterprise-level solution.

Is Cel-Fi carrier-approved?
Yes — and this is one of its biggest selling points. Cel-Fi products are the only 3G, 4G, and LTE signal booster solution authorized for use in nearly 100 countries by 200 carriers. Furthermore, Cel-Fi is authorized for use by each carrier and allowed to transmit on their licensed spectrum without causing interference.

How long does installation take?
It depends on the product and complexity of the space. A simple installation can be completed in as little as 15 minutes, with advanced installations involving multiple antennas requiring longer (4-5 hours). For enterprise-level QUATRA systems, installation time is significantly reduced compared to traditional DAS, taking only days instead of months.

What's the difference between Cel-Fi and a standard booster?
The key differences come down to gain, intelligence, and carrier approval. Cel-Fi is a "smart signal booster" — it relies on intelligent, self-organizing algorithms to ensure the largest coverage area without compromising or interfering with mobile operator networks or other subscribers' signals.