Compared to the sea of Nokias you're probably familiar with, the 6720 Classic appears slender. In reality, the 6720 is only a few millimetres slimmer in width to, say, the 6220 (released last year) but it seems much more so, like a Nokia made out of hot toffee slowly stretching length-wise. This image is strengthened by the gentle kink at the microphone end of the phone, bending gently towards the user's mouth. This design element is probably geared to improving the direction of the microphone towards the mouth, but the kink is so subtle we can't imagine it improves this very much.
http://www.ziddu.com/download/13379976/6720classic_RM-424_Service_Man.pdf.html
