I've deleted all my emails, deleted the sent emails and emptied the trash....and I'm still using 9 gigs of space. What am I missing
What is actually taking up space? No one here would have any way of knowing, look at the device yourself and find out.
Settings > General > Usage
Similar information can also be found by connecting the device to the computer it syncs with in iTunes. Look at the device summary tab.
Retrieving data ...