You can use your mobile phone / tablet / dongle now on air crafts. permitting that you will turn off during take off and landings.
It is well know fact in the industry that not permitting the use of mobile operated telecommunication device on an air craft is a big lie.
If the mobile GSM waves going to interfere with air craft navigation or the aircraft telecommunication ; then what about the all the waves in the air. No matter the use of the device the waves going to exist.
Might have to deploy jammers in the Airport vicinity
So my friends if an airline says to turn it off while on the plane >> that is full of crap.
Next ::>>
The scenario of not to use your mobile phone during refueling is if you drop the phone and the battery dis attaches from it then hit the ground with its probes there is a chance of a spark. That is it !!