My iPhone 6 had about 2.5 GB of free storage , and I didn't download any app or anything like videos or something that would take too much storage. I usually check my usage settings constantly, and after checking the storage usage the same day, it had just 2.0Gb left. Where can the 500MB be used? I checked all my apps and none had used more storage than it did before. I restarted the phone and I still have 2.0GB left. What can I do? I am on iOS 8.2.