Missing mobile on / off toggle (not mobile data)
There is an explicit Mobile Data toggle - that apparently doesn't work.
What is missing is the ability to turn the mobile modem on / off whilst data being off i.e. have it on 'call' mode e.g. 2G / 3 G / 4G with mobile data off.
Note that this is different to an airplane / aeroplane mode toggle that brutally kills all mobile / mobile data / wifi and BT if they are on.