I have seen (although I can't remember where so this might not be worth much) that the freequency clipping cell phones do for compression can make it harder for

I have seen (although I can't remember where so this might not be worth much) that the freequency clipping cell phones do for compression can make it harder for you to processes what you're being told on a phone. Put a better way, cell carriers clip the upper and lower ranges of the audible spectrum. While your voice won't get completely cut, sometimes you lose information the brain uses to process language. Without this, you need to work harder to understand what you're being told than you would if you were talking to someone next to you.