Hey guys. I have the same app disappearing and we have seen this topic a few times. Rooted or not. I'm not at the moment. This device never was and still does the same thing. However they have been able to detect root for some time. Even when I had my D2 they knew. They never said but they have known this way before the Razr. Just an fyi to the whole sim card app being a root detection app. Their knowledge is way beyond the apps installed in fact I believe when they look at the hex they can check and tell by typing it in and pinging or something to that effect.
Sent from my DROID RAZR using Tapatalk
Actually, to be honest - the SIM Toolkit app has nothing to do with them being able to detect whether or not you have rooted your phone. There is actually no real confirmed way that Motorola can check to see if you phone is rooted or not, because in order to do so, they would need direct access to your phone - and currently that would be considered a severe invasion of privacy. The MOST I can possibly think of is that somewhere there is a log file stored that logs statistics about the phone for them to access remotely for remote troubleshooting, and even then, they would need permission granted by you to access your device remotely and tell you about it.
(Remember the HUGE ordeal about Apple and other manufactures' devices logging location data?)
In regards to the SIM Toolkit app, it will appear as needed when your phone is in a certain networking mode. Again, it has nothing to do with root. I have had the app show up on my RAZR and my phone is yet to be rooted.