Hi,
I have the Nokia 3650 and I'm going to buy the new Nokia 6680 when it will be in stores.
In the past I bought some Java Games and some Symbian applications for the 3650. Can I use these applications also with the new 6680?
solider

In most cases, yes. In some cases you may need a newer/update version from the developer. And in some cases you also may need a new registration code from the developer.