Nokia N75 Phone (AT&T;)As a phone, which is the sole reason for my purchase of the N75, call quality is very good and it picks up a signal well (much better than my wife's Samsung, also with AT&T;). However, I have had a problem--there have been three times in three weeks where I have answered or made a call and the person on the other end couldn't hear me. The problem persisted for several trial calls I made immediately afterward. I had to turn the phone off and on to get the microphone to work again.I exchanged the phone and the new one did the same thing--once in the week that I have used it. Nokia was not aware of a microphone problem, but I did read another Amazon review where a person had the same problem, even with a replacement. It may be a design flaw that is exposed because of the way I use the phone, which is about 90% loudspeaker use on calls (I shouldn't speculate on a cause, but that is the only thing I do differently than most people).Other than that one problem, I like the phone very much and am going to keep it. However, it will be frustrating when I have an important call and the person on the other end says "hello...hello...anyone there?", and hangs up, even though I'm yelling "hello, hello, can you hear me?". Obviously they can't, so I'll turn the phone off and on and call them again.