got mine last night... made sounds like a tiny hard drive was r/w in there... called tech support. Apple replaced in store (thanks to manager) and second one hisses too!!! This is BS.
I wouldn't care but you can hear it in vids
Yea, I can sympathize. It's annoying when you pay for an expensive phone but there are so many imperfections. I honestly think it is possible that the microphone is too sensitive. Maybe they'll adjust it in the next IOS upgrade