I've been debating whether to get Nokia 6680 or a Sony Ericsson K750i. They're both similar in price and functionality and both have good points and bad points. However, the Nokia 6680 is touted as a smartphone and the SE K750i is not.
So, is the 6680 a smartphone because it's got an 'open' OS (Symbian Series 60) and, hence, is capable of running many third-party applications? The K750i has a proprietory OS but there still seems to be some software around for it.