What do you think of this phone? I've had mine for one week. While I love the size and style, I've been having problems with background noise. There is a constant hiss when I use the phone normally, but if I use the earbud the sound is fine! Anyone else have similar problems? Even though I bought it from Buy.com, I'm going to try an exchange it at an AT&T wireless store for a new one. I hope they will accomodate me.