ricatchnc

I also have the problem. BitTorrent Sync on my Droid HD MAXX (Android 4.1.2, BTSync v 1.1.38) uses cellular data to sync even when the "Use Cellular Data" setting for the app is not checked. Previously, before I discovered this setting, I had the problem of using almost 2GB in a single day, so set the not to use cellular data. The app seemed to behave until recently when I added a large directory to sync and experienced the problem, again. This time I turned off Mobile Data use completely at the phone level. I set the "restrict background on cellular" option for the app and unchecked the "Use Cellular Data" in BTS settings. Then I removed all the data restrictions sequentially until I have only the BTS setting "Use Cellular Data" unselected. It's behaving again. Syncing now occurs only when Wi-Fi in connected. Could it be that the "Use Cellular Data" setting is only effective for the sync'd folders that exist when the option is set and that sync items added after the option is set aren't constrained?