How to free disk space consumed by incompletely downloaded apps? I recently tried to download a huge app (1.7 gigabytes) on an iPhone running iOS 9. The download failed several times for whatsoever reason. However, the incomplete downloads filled over 5 gigabytes of disk space. How can I clear this space again? Restarting, doing an iTunes backup - nothing solved my problem so far.

Thank you!
Have you tried with a cleaning application like "Checker"? Those kind of applications are used to delete useless data. If you can´t delete it with that kind of applications, try to make a backup on itunes, erase it and restore the iphone.