If you open your favorite root app and it tells you that you don't have root permissions, and then you sware to it that you do because you just rooted this phone the other day don't feel too embarrassed. We have all had this problem at one time or another. You are so used to having root on your device that you are surprised when it is gone after an ota update. You sometimes get a no root message when infact you have root but lack busybox. Either way if you ever get the "no root permissions" message its always a good idea to double check before diving into rerooting.
Simple Root checker determines whether or not your device is truely rooted. There is another "rootchecker" app on the play store that is very popular, but i have had it show my device as rooted when it was indeed not rooted. Simple root checker aims to be more acurate than any other root checking app. Simple root checker will determine, by using specific controls, root status, superuser app, proper installation of busybox, and your current version. The app includes a modern, intuitive, and efficient graphical interface to make using it pretty enjoyable. Grab this free app from the source link below.