Yes, the stuff for the phones is on its own track. In the Java universe, there's
J2EE for enterprise applications, J2SE for desktop applications, and J2ME for small devices. Most of J2ME is developed as Java Specification Requests (JSRs) under the Java Community Process (
http://jcp.org/).
For an overview of wireless Java, see:
http://wireless.java.sun.com/getstart/