Its NOT relative to LGPhone.apk. I can "port" this but will NOT work with your phone (either mine).
Dialpad comes with LGContacts.apk, that's why you see it in first post.
com.lge.systemservice.core.jar is more relative with your problem.
I can not help more with out logs. You have an other phone!
[If you want, you can try to replace the relative *.png icons from LGContacts.apk (from G2) to yours *contacts*.apk]