Cel-Fi by Nextivity DUO+ Smart Signal Booster


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Cel-Fi DUO Smart Signal Booster
  • Powerful single-carrier solution for Verizon or T-Mobile users
  • Coverage up to 13,000 sq. ft.
  • Uses CEL-FI’s award-winning network safe Smart Booster technology
  • Wireless setup (no cables needed)
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Cel-Fi by Nextivity DUO+ Smart Signal Booster

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About the CEL-FI DUO+ Signal Booster

The CEL-FI DUO+ Smart Signal Booster for Verizon and T-Mobile by Nextivity is part of the next generation of intelligent signal boosters. All CEL-FI products are designed and developed using the most advanced radio frequency and signal processing technology.

It greatly enhances 4G, LTE, and 3G cell service for all your wireless devices (smartphones, notebooks, hotspots, etc.) on Verizon and T-Mobile for any home or office up to 13,000 sq ft.

The CEL-FI DUO+ has several advantages over traditional signal boosters:

  • Plug and play setup: just plug in the Network and Coverage units and get better signal.
  • Monitor performance with the CEL-FI WAVE app.
  • Extreme power good for everything from apartments to large homes.

Unlike multi-carrier signal boosters with a limit of +70 dB, CEL-FI’s single-carrier solution can boost signal up to +100 dB. That’s a difference of +30 dB or up to 1000x more power compared to multi-carrier boosters.

Eliminate dropped calls, slow data, and poor Verizon and T-Mobile signal from your life with a CEL-FI PRO Smart signal booster.

  • Boosts 4G LTE for any home or office covering up to 13,000 sq. ft.
  • Works for all phones & cellular devices, Verizon or T-Mobile only.
  • Complete kit: all parts included, easy install.
  • No monthly fees, no need to be connected to wifi, it just works.
CEL-FI Wave App

CEL-FI Wave App

cel fi app

CEL-FI WAVE is the software application and cloud-based portal solution used for registering, setting-up, optimizing, remotely monitoring, and updating the CEL-FI hardware. Available on iOS, Android, Tencent, PC, and Mac devices.

Who Is This For
  • Those who have large apartments.
  • Those in rural areas who struggle with Verizon and T-Mobile signal.
  • Anyone with a large home, office, warehouse, or other building who wants better, more reliable Verizon and T-Mobile signal.
Kit Includes
  • CEL-FI DUO+ Network Unit
  • CEL-FI DUO+ Coverage Unit
  • Power Supplies
  • Mounting Brackets
  • Screws & Drywall Anchors
Technical Specifications
Nextivity Cel-Fi DUO+ Smart Signal Booster
Model D32-2/4/12
Frequency Band 12 - 700 MHz
Band 4/66 - 1700/2100 MHz (AWS)
Band 2 - 1900 MHz
Max Gain 100 decibels (dB)
Power 100-240 V AC, 47-63 Hz, 12 V DC
Dimensions Network Unit 6.24 x 5.75 x 2.32 in
15.85 x 14.6 x 5.9 cm
Dimensions Coverage Unit 6.24 x 5.75 x 2.32 in
15.85 x 14.6 x 5.9 cm
Weight Network Unit 1.23 lbs
0.56 kgs
Weight Coverage Unit 0.86 lbs
0.39 kgs
FCC NOTICE This is a CONSUMER device. BEFORE USE, you MUST REGISTER THIS DEVICE with your wireless provider and have your provider's consent. Most wireless providers consent to the use of signal boosters. Some providers may not consent to the use of this device on their network. If you are unsure, contact your provider. You MUST operate this device with approved antennas and cables as specified by the manufacturer. Antennas MUST be installed at least 20 cm (8 inches) from any person. You MUST cease operating this device immediately if requested by FCC or a licensed wireless service provider.
WARNING: California's Proposition 65 This product can expose you to chemicals including Nickel (Metallic) which is known to the State of California to cause cancer and Bisphenol A (BPA) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

Installing the CEL-FI DUO+ is remarkably easy.

  • 1. Set up the Network Unit near a window with the strongest Verizon and T-Mobile signal and plug it into an outlet.

  • 2. Set up the Coverage Unit where desired, preferably as far away from the Network Unit as possible to avoid oscillation. Plug it into an outlet.

  • 3. Download the Cel-Fi WAVE app to register and set up your booster.

  • 4. Enjoy your boosted signal!

  • Technical Support & Troubleshooting
    If you need help setting up your amplifier system and troubleshooting support: our trained product specialists can assist. Just call us at 1-800-470-6777 or email

Frequently Asked Questions

How Do I Set the Cel-Fi DUO+ Up?

There are a few things to consider before setting up your Cel-Fi DUO+.

First, locate the area in your home with the strongest cell signal. Preferably, this on the second or third story near a window. Place the Network Unit there, and plug it in.

Second, find an area as far away as possible, preferably with some vertical separation, from where you placed the Network Unit. Place the Coverage Unit there.

Setting up with the App

Now that you’ve physically set up the DUO+, you’ll need to activate it with the Cel-Fi WAVE app.

  1. Register your booster. This is a legal step and will tie your app to your booster.
  2. Enjoy your boosted signal!

The app has many other features, allowing for remote monitoring, optimal antenna setup, and more – however, these features are all optional.

Please call us at 1-800-470-6777 for a free consultation and answers to any other questions you might have.

How Does the Cel-Fi DUO+ Boost My Signal?

The DUO+ creates a “bubble” of strong signal between the two units, so make sure there is as much separation as possible.

Where Do I Place the Network Unit and Coverage Unit?

Place the Network Unit in the place where signal is strongest, as high as possible.

Place the Coverage Unit as far away as you can from the Network Unit, with 100 dB of loss being the maximum distance away they can be placed.

Can I Use This Without Downloading the WAVE App?

For a basic setup of the Cel-Fi GO-X, use of the WAVE app is required. Once the booster is registered, you no longer need the app if you do not want to take advantage of its enhanced features.

What is the Return Policy?

We provide a 30 day money back guarantee and a two-year warranty on all Cel-Fi DUO+ units.

Customer Reviews