I have a tablet (allwinner a13 mid tablet 7″). Contacts application Contacts.apk is installed, but the icon is missing in the application list.
It can be started from terminal emulator. My android version is 4.0.4, i run on the terminal this command:
am start -n com.android.contacts/com.android.contacts.activities.PeopleActivity
or
am start -n com.android.contacts/.activities.PeopleActivity
[see: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/4.0.4_r2.1/com/android/contacts/activities/PeopleActivity.java?av=f]