i have the 7 plus on att. when i am in call with someone else who has a normal 7 and is on att, they say i sound muffled. so i turned off phone noise cancellation and it "kinda" helped but not really. went to the apple store they said same thing turn off phone noise cancellation and it will sound better. so i went with that advice and still seem to be getting complaints.. went to att they claimed there towers are fine and that the sim in my phone was fine as well. what do i do about this i know the intel modems were not doing to well on att. help please anyone. thanks