Thanks for that, west lakes.
As we all know, legislation always lags technology.
The fact remains, however much IO540 might want to search for loopholes and room to squirm, that it is illegal to use a mobile phone when airborne.
The fact also remains that it is very, very stupid to use a handheld when mobile, to make calls unless in case of an emergency, to send texts, to listen to music, etc. etc.