I just started getting a daily prompt about a Samsung Security Update for Android on one of my S3 phones (but not on the other). I did a search to see if this was legit, and found a few things on it (like something about Samsung Knox app, which does not appear in my app drawer), but nothing on how to disengage this annoying prompt every day. Is there any info on this, and why it is doing it to just one phone (both are on Kit Kat, on AT&T)?