You know, the one that SHOULD show up at the very left when you click on a contact's picture, and it brings up (should bring up) a picture of a phone on the very left, along with other icons representing other APK's (such as e-mail, mms, facebook, etc. etc.)??? It currently just brings up a generic android icon instead.
I've gone through several APK's, and thought I had found it in Phone.apk which was missing a PNG called ic_launcher_phone.png, which just happened to be the exact same icon that's not showing up. Anyway, I inserted the image into the Phone.apk, and it's still showing a generic android icon instead of a phone when you click on a contact picture.