how old are the mics. cause for the cell phones to be interfireing they would have to be pritty old. i use wireless on a regular basis with my theatre and i have my phone on all the time with it on silent of course. and i never get any interferance.
it's a old term that has just stuck. anyone i have talked to and worked with call it gel weather it be made by Rosco or Lee, etc
i Call it Gel. and when you order it from the manufacturer i think they refer to it as gel.