Bugfender is quite optimized for battery and data usage, but still it’s sending all the logs from the application, so it’s going to consume some extra data. The specific amount depends a lot on your application, but typically in the order of a few megs a month.

We recommend enabling the devices only when it makes sense to you: for example, when beta testing the application it’s very nice to have all devices enabled; then, when you reach production we recommend disabling Bugender for all devices and enabling only specific devices that you suspect have a problem.