Why cant you use a mobile phone on a plane?

Question

Obviously its due to strict anti terror rules, but harmlessly using a mobile phone on a plane cant be wrong right?

But since its advised not to use it on airlines, it must not be that important or hazardous to the aeroplane, because not everyone hinders what the rules say, so what are the results to using a phone on a plane and why is the rule in place?

Answer 1

I worked on an intensive care unit, there were signs all over the hospital banning mobile phone use, yet consultants, staff, the organ transplant coordinator, all used mobile phones, and not one item of equipment was adversely affected, it was all just a power trip, some of the same people who were blatently using their own phones were aggressively telling patients & visitors how "vital" it was to observe the rules.

Answer 2

What do you think airliners use for NAVIGATION?... they use RADIOS... and what do you think a cell phone is?... it's a RADIO... get the connection.?  They can INTERFER with the navigational gear airplanes use.