
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.
13 people found this review helpful

Anthony Comerford
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This mobile phone booster is having trouble finding the 5G. 4G it can find, but in a 5G area it is lost. After giving the details to the developer of the app, I never heard back from them.
1 person found this review helpful
Nextivity, Inc.
12 August 2025
Hi,
What is the model and Android version of your phone? If you can provide that information at support@nextivityinc.com we may be able to help you.
Thanks.

Noah Blair
Honestly I'm so sick of this app. Just a simple thing like going back to the last page involves you having to get your phone? Go all the way to the top and press the back button, however many times you need to. Instead of just pressing back on your phone.
4 people found this review helpful
Nextivity, Inc.
16 June 2025
Thanks for your feedback. If you'd like to discuss the details of the problem you mentioned. Please send the details or screenshot to support@nextivityinc.com. We'll pass it along to our development team and see if there is any way we can improve it.