welcome to the forums!!!!!!!
i moved you to the nexus 4 root forum where folks who has your device can help you out better.
now you said unroot? if you unroot you will not have superuser. or at least it will not work.
so i'm a little confused as to what you are trying to do? is the phone rooted? are you unlocked? what wifi app are you talking about.
please read the root stickie at the top of this forum. if you can't find it here is the link:
http://androidforums.com/nexus-4-al...nexus-4-all-things-root-guide-12-18-12-a.html