Confusing entry in Settings -> Cellular network
- Egde swipe from top - disable Mobile Data
- Open Settings -> Cellular Networks
- Insert password (or press cancel, it seems that it does not matter)
- Notice "Mobile data" with checked tickbox - it seems that Mobile data connection is still on
- However - unticking it disables modem altogether.
So I guess that instead of "Mobile data:" it should be "Modem status" or something similar...