My girlfriend has a lock on her phone and ipod. Does this mean anything?

Title pretty much says it all. My girlfriend has a lock on both her phone and ipod touch. My phone doesn't have a lock on it. Does it mean anything or am I just over thinking it?
Updates
+1 y
I have been thinking that my girlfriend may be cheating on me. She's been acting different (not being as sexual, won't kiss me as much as she used to, she never lets me see her phone when she gets a text message).
My girlfriend has a lock on her phone and ipod. Does this mean anything?
Post Opinion