I intended the second paragraph as my though on why telecommunications related organizations don't exactly discuss whether cellphones works on board of a plane

I intended the second paragraph as my though on why telecommunications related organizations don't exactly discuss whether cellphones works on board of a plane and this intention was then probably lost by inserting that paragraph break :) FAA's and related regulations are probably motivated by fact that it's essentially impossible to test that aircraft's systems work as intended even in presence of random consumer devices on board. EMC issues can be caused by almost any electronic device not only devices containing radio transmitters (eg. EU regulations require EMC certification for anything that, possibly internally, produces or uses signals >=1kHz).