and Crash One to answer your question please do a quick search on mobiles and aviation. You will see there have been a few studies. I cited earlier one by Boeing in which they found no (note zero) evidence of any interference caused to radio navigation equipment in consequence of a mobile phone. They even purchased a number of 'phones form passengers on flights where the 'phone had been the only 'phone left switched on and was alledged to cause interference - they could not reproduce the problem on a single occasion. Draw your own conclusions.
So far as radios are concerned I regularly forget to turn my 'phone off these days - you will often hear a series of short beeps on the radio during the climb as the 'phone "attempts" to remain connected to the network.
Personally I always made a point of turning off my phone before every flight - I never make a point these days but I try to remember to do so. That inevitably means I often fly with it on, but I have never had an issue. If the flight was in IMC I still ensure all phones are tunred off - why, well it just makes me more comfortable to eliminate a possible risk however small I believe it may be.
If you have a problem with the radios check you have turned off your 'phone - it is not rocket science, if that doesnt work try something else.
In recent months I have had far more problems with serious interference from illegal ground based installations - I suspect the authorities time would be far better spent prosecuting those concerned or at least indentifying the culprits and asking them to desist because their actions are dangerous and have nearly caused me to go elsewhere recently during an IP