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Cel-Fi DUO+ 3G/4G/LTE Smart Signal Booster for T-Mobile

No Longer Available

Item Number: 7921



This is a special-order item that requires additional lead time. Contact us before ordering if you need a more exact ETA.

The Nextivity Cel-Fi DUO+ has reached its End of Life (EOL) and has been discontinued. An alternative option is the Nextivity Cel-Fi GO G41 Smart Booster.

The Nextivity Cel-Fi DUO+ is the next generation of intelligent repeater kits for home and business users looking to boost their cellular network performance. This LTE signal booster is for T-Mobile network users and works with LTE bands 2, 4 and 12. Each all-in-one cell booster kit can provide high-gain coverage improvements for up to 15,000 square feet. The coverage area makes this all-in-one T-Mobile repeater kit a smart choice for large households and small businesses that need to pull in a better signal for data, voice and SMS texting.
The T-Mobile Cel-Fi signal booster is completely wireless both in and out. Furthermore, it automatically sets itself up and adjusts itself based on signal strength. As long as there is at least one bar of signal, the network unit will pick it up, boost it, and relay the signal to the coverage unit via an encrypted wireless link. A software-based coverage pattern analysis is used to optimize gain. With a peak gain of 100 dBi, it can turn even a weak signal into a robust connection. The stronger signal enhances the performance of every device in range with a T-Mobile LTE SIM card, including smartphones, jetpacks and routers with embedded modems.
We are ready to answer your questions here by phone or email. Here at 5GStore, we are dedicated to providing the best customer service.

Amplifier Features:

  • Coverage area*: up to 15,000 square feet

  • All-in-One Kit? YES
  • Compatibility: T-Mobile 3G/4G/LTE/AWS (LTE bands 2, 4, 12) ONLY - does not work with other carriers
  • 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.

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All Reviews (14)

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Only customers who bought this item from 5Gstore can write a review - these are all verified 5Gstore purchases

Date Added: 10/09/2020 by Glen G. (Rockford, AL)
Works as advertised. Get 3 bars now and I can talk and FaceTime.

Date Added: 06/22/2020 by Matthew D. (Winneconne, WI)
Signal in house is better but not what u would have expected for the price.

Date Added: 06/07/2020 by Steve M. (LAKE OSWEGO, OR)
Works perfectly as advertised

Date Added: 05/29/2020 by Aaron P. (Success, MO)
If I'm just holding the phone with 1 hand connection is a tad slow but still stable. However if I use both hands to play a game in landscape mode it still frequently drops connection. Voice had slight static. There are 2 bars in the window.

Date Added: 05/16/2020 by Robert K. (Littleton, NC)
This is replacing a unit that failed just before the end of the 1 year warranty. I tried to get the filed unit returned but 5g would not provide voice support and the trouble shooting they were insisting on was preposterously ludicrous over email. I have 50 years of experience working in complex systems and this experience was intolerable. I reordered a new unit because I like them(this is my 3rd) but I did because it is somewhat unique albeit fragile.

5Gstore Comments:
We're sorry you weren't able to get the original unit working! Unfortunately your warranty had already expired when you contacted us, which limited the options available, and troubleshooting is always required by the manufacturer to get a replacement approved. Please let us know if you have any issues in the future and we will be happy to help.

Date Added: 10/09/2018 by Brian P. (Bremerton, WA)
Got Verizon signal into building interiors that never had it before.

Date Added: 09/16/2018 by Ted. (SHELBY TOWNSHIP, MI)
Works great for 700mhz band on T-Mobile!

Date Added: 04/06/2018 by Randall R. (Rocky River, OH)
Seemed to improve the signal significantly for us to use air cards in our new warehouse while we wait for our network to be installed.

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)

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Will the Cel-Fi DUO+ work with 5G?

No, the Cel-Fi DUO+ only supports LTE signals.

Can an external antenna be connected to the Cel-Fi DUO+?

The Cel-Fi Duo+ does not support external antennas.