Hi, Just received my new replacement iPhone 4 (2nd replacement). Everything works except for two things which are bothering me. 1. When on a call I keep hearing a hiss (white noise) in the background when the other person is not talking. When they speak it goes away, but comes back as soon as they become silent (using the speaker on the top as in speaker located for the ear). 2. Used the Voice Memo app; when I listen to the memo I recorded my voice isn't as loud as it is on my wife's 3GS, also the background hiss/noise is present through out the recording (recording being played though external speakers). Anyone else having these issues and do you think this warrants another trip to the Apple store (who will probably kill me if I try to get a replacement ) Btw this is a week 30 iphone 4, made in factory 83. PS: My previous phone did not have these issues...though the GPS was messed up...phone wouldn't lock onto my location!