[karmakaze]

This is a bad example. All it did was move the implementation of multiple behaviors (calls, messages, alarms, notifications) into each of the state instances.

A better way to handle this is to separate policy and mechanism. The state has configuration about handling of (calls, messages, alarms, notifications), and when each thing needs to be done that call/message/etc config is requested from the state and processed uniformly from there on out, not by the phone nor the state but by the call/message/etc handler.