I have reason to believe it might be Spyware...loaded onto cell phone remotely, By some scumbag who wants to know every move being made by you... while invading your privacy to the hilt! Texts, emails, photos, apps, contacts, location, etc....if this is the case
Got a call on my office phone -- they left no message........but have called a few times in the past couple days and somehow I'm not at my desk when the call comes or I would've answered it -- thanks for the previous comments..........this will keep on ringing!