
Zach Rutledge
The app provides some useful information for helping to find the right location for the two Cel-Fi devices, more than just the number on the front panel. Unfortunately, it's extremely difficult to get connected to my Duo, as it constantly seems to say I'm out of range despite being halfway between the transmitter and receiver boxes. Once it fails, it won't connect again until I force close this app and try again. Either way it's also EXTREMELY slow to connect, so prepare to set aside 10+ minutes just to find the device. When it does finally connect, it will stay connected for the duration the app is open, unless you move out of Bluetooth range. Then it'll break and you won't get back in until you force close the app. Again. The app has a function to enable/disable which bands/tech are boosted, but this does not work for me. It either breaks the Duo completely, requiring both boxes to be reset, or causes the booster to alternate between working and "overload/failure" mode. I'd love for it to only boost 4G and not 3G since that is unusable here, but it doesn't work.
14 people found this review helpful

thevioletdivide
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5 Mar 26: Almost never finds the device (GO G31) when scanning for it. Attempting to update software, IF it connects, is also a shot in the dark; it might spend half an hour downloading and trying to install, only to fail. When the device is working, service is great. But the app is a hot mess, and trying to manage the connection/device is next to impossible.
Nextivity, Inc.
March 5, 2026
Oh no! We sincerely apologize for the troubles you've had with the app. We'd be happy to take a look into this for you, please contact us at support@nextivityinc.com. Thank you.

Rodney Morris
Was going to give 2 stars rating. as this app just wouldn't do what it was required to. The app gets stuck on downloading settings, then time out, and ask if you need help with installing. Ok, I worked out why this was happening. The phone needs a service to set up. Why is the app trying to use wifi to set up it? It will fail every time with wifi turned on. Just turn your Wifi off, and it's loads and setup farst every time. But I need wifi on for my android Auto to work.