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Cel-Fi DUO+ 4G LTE/XLTE/VoLTE Smart Signal Booster for Verizon

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Item Number: 6614



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The Cel-Fi Duo+ Smart Signal Booster repeater kit can be used by home and enterprise consumers to improve indoor cellular signal for better Verizon voice and data performance. This model works with Verizon’s U.S. network and is compatible with their 4G LTE and XLTE frequency bands, boosting all Verizon devices within range. Cel-Fi provides coverage for up to 15,000 square feet, making it ideal for large homes and offices.

Cel-Fi boosters are radically different from traditional repeaters, as they are the only intelligent booster that's wireless-in/wireless-out. The Network Unit receives the signal from the mobile network (it requires as little as one bar of signal) and relays it wirelessly to the Coverage Unit that amplifies it for up to 100dB of gain. The wireless link is encrypted as well to maintain secure communication. It supports as many as three cellular bands and can still function in the presence of other RF signal emitters or Wi-Fi devices.

Cel-Fi is easy to set up and doesn't require the installation of external antennas or bulky coaxial cables. It also doesn’t require handset registration or a configuration setup by the user. In fact, Cel-Fi intelligently and automatically senses and adapts to its environment, including to changes made by your carrier or to changes caused by nearby equipment like Wi-Fi or other Cel-Fi devices. Gain is optimized using a software-based coverage pattern for better performance. This Verizon booster simplifies LTE signal boosting and can quickly add thousands of square feet to a coverage area!

Amplifier Features:

  • Coverage area*:up to 15,000 square feet
  • All-in-One Kit? YES
  • Compatibility:This amplifier supports 4G LTE, XLTE, and VoLTE (HD Voice) for Verizon only. It is NOT compatible or approved for use with ANY other carrier. It will not help with Verizon 3G, and it will only help with voice/calling if you have HD Voice/VoLTE enabled on your phone and are in an LTE area. Read more about enabling HD Voice/VoLTE
  • Installation: Cel-Fi doesn't require the installation of external antennas, bulky coaxial cables, handset registration, or a configuration setup by the user. In fact, Cel-Fi intelligently and automatically senses and adapts to its environment-including to changes made by your carrier, or to changes caused by nearby equipment like Wi-Fi, or other Cel-Fi devices. Multiple Units of Cel-Fi can be deployed in large offices and will not interfere with coverage strength.

Stop by our warehouse in Cary, Illinois for a demo, as we have one of these set up and in use!

*Many factors will influence the actual coverage area you will see from a repeater, including layout/floorplan, construction, and original un-amplified signal strength. Depending on your situation, you may see more or less coverage than the estimates listed here. It is not possible to guarantee coverage area.

Download brochure for Cel-Fi DUO+ Smart Signal Booster for Verizon

celfi pro install

Installation notes:

  • There must be at least one bar of usuable signal at the window in which you install the Network Unit. 

Features & Benefits:

  • Wirelessly linked Network and Coverage Units (5GHz U-NII band).
  • Peaceful coexistence with adjacent 802.11( 2.4GHz&5GHz), and femtocell devices.
  • Max EIRP: 10 dBm downlink per 5 MHz and up to 22 dBm uplink, per band.
  • Software-based optimization of integrated antenna coverage pattern which maximizes system gain and provides improved
  • Automatic Gain Control (AGC) based on real-time echo-cancellation.
  • Seamless call handovers between Cel-Fi systems and the macro network.
  • Subscriber devices enjoy improvements in battery life.
  • Bluetooth communications between a mobile handset and Cel-Fi via our Cel-Fi WAVE Mobile App provides software update
    capability and advanced information for technical support.
  • Adaptive signal equalization.
  • Includes Nextivity's 3rd-generation (ARES) chipset with 6 core processor.
  • Up to 3 cellular bands supported; relaying two simultaneously. Cel-Fi DUO+ boosts service for Verizon 4G LTE and XLTE only.
  • Supports E-UTRA bands 2(1900), 13(700) and 66(2100/1700)
  • Support for 3GPP Rel. 10 features.
  • Network-Safe software prevents uplink system gain from exceeding path loss between Network Unit and closest tower,
    thus eliminating unnecessary rise in base station noise level.
  • Uplink Muting Mode automatically shuts down uplink cellular transmissions when no active user equipment is detected.
  • Secure and ciphered provisioning for only Verizon’s channels based on network broadcasted PLMN ID.
  • Full Band Scan feature discovers newly deployed and re-farmed spectrum

Package Includes:

  • Network Unit
  • Coverage Unit
  • 2 Power Supplies
  • 2 Mounting Brackets
  • Quick Start Guide


  • RF Specifications:
    • Radio 1: Band 2
      • Frequency DL: 1930-1990 MHz
      • Frequency UL: 1850-1910 MHz
    • Radio 2: Band 13
      • Frequency DL: 746-756 MHz
      • Frequency UL: 777-787 MHz
    • Radio 3: Band 66
      • Frequency DL: 2110-2180 MHz
      • Frequency UL: 1710-1780 MHz
  • Environmental:
    • Operating temperature: 0° to 40°C
    • Storage temperature:-25° to 60°C
    • Relative humidity: 5% to 95%, noncondensing
    • RoHS II 2011/65/EU
    • WEEE (2002/96/EC)
    • ErP 2009/125/EC
  • Power:
    • 12VDC via external supply (two included)
    • External Supply: 100 to 240 VAC, 47-63Hz
    • Power consumption less than 25W per unit
  • Physical Specification:
    • Network Unit: 158.5 x 146 x 59mm, Weight 19.75oz.
    • Coverage Unit: 158.5 x 146 x 59mm, Weight 13.75oz.
  • Standards:
    • FCC Parts 15, 20, 22, 24, 27
    • EN 301 489 -1, 17, 23
    • EN 301 893
    • EN 301 908-1, 11, 15
    • EN 300-328
    • EN 62311
    • UL 62368-1
    • CSA C22.2#62368-1 IEC/EN 62368-1
    • 3GPP TS 25.143 Rel.10
    • 3GPP TS 36.143 Rel.10
    • EN 50566/62209-2/62479 (SAR) Bluetooth SIG

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 the FCC or a licensed wireless service provider.
WARNING. E911 location information may not be provided or may be inaccurate for calls served by using this device.
Please note, the four largest carriers - AT&T, T-Mobile, Verizon and Sprint - and more than 90 regional carriers have given blanket consent for use of all boosters certified to the new FCC standards.

It is that simple!

No mounting antennas to the roof, running cables through walls and ceilings, and no unsightly panel or dome antennas on the walls and in the ceilings of your home or office. Instead the Cel-Fi DUO+ is comprised of just two pieces of hardware, a Network Unit (NU) and a Coverage Unit (CU). Installation is as simple as placing the NU in a window where the Verizon signal is the strongest and connecting it to power. The CU is then placed elsewhere in the home or office and connected to power. The NU picks up and amplifies the Verizon LTE signal, wirelessly sends the signal to the CU, and the CU pushes out an amplified cellular signal for any devices in range. It is that simple!

Read our Duo+ review

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All Reviews (6)

Only customers who bought this item from 3Gstore can write a review - these are all verified 3Gstore purchases

Date Added: 11/22/2017 by Jackie H. (Wausa, NE)
Works as advertised. Where we were getting 1x service we now get 3 & 4 bars LTE.

Date Added: 07/31/2017 by Richard M. (Westlake Village, CA)

Date Added: 07/24/2017 by Brad J. (Dunmore, PA)
not the best for commercial buildings. The range advertised is definitely for open spaces and not buildings with walls. The signal drops off fast beyond 75 feet and they seem very directional in that the faces of the units need to be pointed at each other. We are seeing a small improvement but not as good as I had hoped.

Date Added: 11/08/2016 by Glinda G. (Covington, LA)
This product does what we needed it for. To boost cellphones in our office which
did not have very good reception.

3Gstore Comments:
Thanks for your feedback! It looks like you might have selected 1 star when you meant to select 5, since everything is working out well :) But let us know if there's anything we can help you with!

Date Added: 10/11/2016 by Anonymous 3Gstore Customer
I've used several competitors solutions That was not by choice unfortunately. I started with the zBoost which was a disaster trying to prevent oscillation (to close / to far) and never produced any real tangible results after a TON of effort. I then moved to the weBoost which was marketed under another name when I bought it from Wilson but the hardware is identical. It was a definite step forward but where I live with 1 bar starting out it really didn't get me where I needed to be and again I'm running co-ax cable all over the place. Just bought the Cel-fi Duo+ for Verizon 2 weeks ago and it is the first signal boosting product to genuinely meet my expectations. I went from 1 bar to a solid 3 bars now on the phone, data speeds jumped to between 6-10mbps both down and uploading from 3down/0.3up before the booster and calls no longer breakup. I've noticed calls sound different sometimes now too and I believe that Verizon's Voice over LTE now works because I have enough signal to do it. Also of note, this boosts 100dB whereas I think the others are 50dB and 60dB.

So yeah, the results were good. The real kicker is the install was great. There basically is no install compared to the work needed for the other boosting options. You plug the antenna box into a power outlet where the signal is strongest (I have mine sitting on the window sill). Then you go towards the other end of the structure and plug in the amplifier box. No co-ax from an outside antenna. No co-ax between the 2 units. Just 2 boxes that plug in. There's an easy to read LCD that tells you closer or farther and a signal number that goes up or down to help with placement. Soooo much easier. Getting ready to buy another one of these for my office. Coverage area is great, definitely no issues anywhere in my 2400sq ft home.

Date Added: 07/21/2016 by Tom. (Schaumburg, IL)
Cel Fi performs exactly as advertised.

I have customers who have been waiting for this solution for a while. The area I support from a technical perspective is Health Care. Hospitals have always been notorious for poor in building coverage. DAS is very expensive and network extenders require a GPS fix and back haul.

The Cell fi performed as good and better than I had anticipated. First test out of the box was at home and in my basement where there was no 4G coverage ever, within 5 minutes of unpacking the 2 boxes and plugging them in I had over 8 Mbps down and 1.7 Mbps up. Next day, I visited a customer (hospital) with a common issue. We were unable to get a GPS fix as the location was too far from a window or GPS signal to get the network extender to activate. Again, in record time (this is simple to set up and takes literally minutes to work) the room was filled with notification sounds of text messages coming in to Mobile phones for the very first time. They were ecstatic. The network security resource reported that no rogue devises popped up on his diagnostic tool and he cleared the device for purchase.

My final check for the week was at an airport for Emergency Services Flight for Life where signal issues persisted, again, a significant improvement in speed test results and coverage. The only issue was the inability to pass signal through a Physical Firewall separating the Hanger from the dispatch offices where cinder block and whatever else was used in the building construction. It was not a deal breaker, just needed 2 sets of boxes for each area on either side of the brick fire wall.

Affordable, childs play to install, and it works great. I enthusiastically endorse and recommend giving this a try where not having coverage. Is not an option. Thanks to my friends and solid resources at 3G store for Cell Fi and all they do every day.

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Cel-Fi Duo+ Quick Start Guide Download installation guide/manual

Purchasing this product gets you access to the following exclusive 3Gstore resources:
Cel-Fi: Installing multiple systems in 1 location
Cel-Fi: How to Register via Computer 06/07/2017
Cel-Fi: How to Register via Wave App 06/07/2017
Cel-Fi Duo+ (Verizon) Troubleshooting Guide 07/15/2016
Cel-Fi DUO+ - Enable VoLTE on iOS and Android 06/29/2016
Cel-Fi Wave Application 04/26/2016
Cel-Fi Pro Troubleshooting Error Codes 04/26/2016

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