I jailbroke my iPhone so that I could make use of the F.lux app which allows me to sort of dim my screen with an orange hue so that I could read on a flight I took recently without annoying other passengers. I'm home now, though, so I don't mine un-jailbreaking.
With that out of the way, here's what's happened. A few days ago I was reading and my phone froze for a moment and the new voicemail popup appeared and told me that I had 2 new voicemails, which I didn't have, and then the camera light turned on and stayed on. So I rebooted the phone and it was fine. But now, moments ago, 4 new apps appeared, seemingly at random, on the home screen - AdSheet, FieldTest, iOS Diagnostics, and Setup. All 4 of them have blank, white icons.
Should I be concerned about a possible security breach of my phone or is this some of the unexpected behavior that one could expect once they jailbreak?
Also, I applied the PDF fix from Cydia and changed my SSH password immediately after jailbreaking. I don't know if that info is important, but is given here for completeness.