Originally Posted by
weekilter
Affecting ground communications is a concern. Affecting avionics is not. It's never been proven that cellphones interfere with avionics.
I don't have the link handy, but I have seen on an FAA web site, confirmed cases of loss of ILS glide slope lock, and numerous cases of interference to intercom and air to ground radio communications from cell phones. I'll try and relocate the link.