iPhone available space: significant difference between iTunes and iPhone I am trying to update my wife's iPhone from iOS 7 (.x.x) to 8 (the latest). I was trying through iTunes because the iPhone says only around 300MB is available. iTunes shows around 7GB as available space. But when I hit update, it complains that at least 770MB should be available and it is not.

Is this a known issue that iTunes reports a larger available space than iOS? I have read about the "Other" storage space problem, but this is about "Free" space.

Also, is there a workaround to reclaim this "free" space?

This is a iPhone 5S, latest iTunes (12.0.1.26) on OSX Yosemite (10.10.1)

iPhone:  



iTunes:
I had the same problem too. My iPhone 6 showed free memory at less than 200mb and iTunes showed more than 5.6GB.

To correct this problem: go to your device (iPhone) and go to settings, iTunes &amp; App Store, click on your Apple ID and select Sign Out. Go back and Sign in again. This is a lot simpler than restoring your backup.