Perhaps your phone likes to talk to those two people without you listening in?it has called 2 people on its own. the S voice has turned itself on twice.
Perhaps you should backup anything important using the Kies software on your computer and then perform a Factory Reset?When I go to Manage Applications - All, at the very bottom there is an Android icon for an app that has nothing but Chinese characters for the app name, 4KB. When I select it and check its permissions, it appears to have every possible permission - directly call phone numbers, receive text messages, take pictures, record audio, etc. etc., modify contact list, erase SD card, a very long list.