For a device that's meant to be held up to your EAR, this is a legitimate concern. I have had every iPhone except the 3G and I'm not one to seek out problems or even care about minor issues like screens being warmer or what have you. But the fact is that I noticed this sound on my own within hours of purchase, before even reading about it online. If it existed in previous models, it was many times quieter. This is a real issue and a legitimate one that affects one of the main features of a phone (you know...making phone calls).