In emulator the activity used to show the in call screen of an incoming call is implemented in a class called "com.android.phone.InCallScreen".
Is this true on all android phones or just unmodified Android software as released by Google?
It is generally different according to manufacturer package name like
com.<manufecturer>.phone.InCallScreen
If you want to check with different devices, Hierarchy Viewer
or Devices
tab of Eclipse will show process
name when in-coming call comes