They added some Series 40 phones in recent months, so that changed. Basically, it's either supported or not - directly by iSync. If it's _not_ supported (see the iSync devices list linked to above), but you know it's a phone very similar to one that _is_ supported, you can try to hack iSync into thinking it knows about your phone. I _thought_ the 6310i was supported out of the box at some point in time, but maybe they dropped the support for it? :/ Plus: There's no similar phone to the 6310i on the list, because that phone is older than the (later) Series 40 phones.