My memory space on my iphone is taken up by apps that aren't synced onto my iphone even after I've deleted them but they keep showing up on my itunes. How do I delete them completely to stop them taking up space?
Check over them in iTunes to ensure they are not being synced again.
Also there is an app you could download called PhoneClean that would clear the phone of any unnecessary data. Free download for Windows & Macs.