Why is there so much gigs missing from my iphone? Please send

I got a 16gb iphone 5, And it works just fine. But when i look into itunes it says 4gbs are used in apps and 7 GBS in "other"! I know the os takes memory but it can't be almost half my total memory!

Nothing "missing".

Take a photo, delete it… The photo will remain in "recently deleted photos" for 30 days.

Get a voice mail, listen to it, delete it… The voice mail will remain in deleted until you clean it out…

There are a couple of other small contributors to "other"… These are the big ones.