There's a lot of personal information residing on your phone, possibly even more than on your computer, so it's only a matter of time before someone tries to access it.
The perp can be anything from a paranoid significant other to a malicious identity thief. Personally, I'm more worried about nosy friends and siblings trying to infiltrate my Samsung Galaxy S4 when I'm not paying attention.
If you have a secured lock screen with a good enough security lock, it's likely to keep people out, but it can't keep them from trying. To combat this, you need to first know who the culprit is, and you... more