2 months ago upgraded from 5s to 6s, purchased at Verison. Agent there transfered all data from old to new. 5s was 35gb, 6s 64gb. 5s was at about 32gb used when changed fones. I did not look at storage in 6s for a month, last week I got a warning that I was about to run out of storage. It showed 400mb left. I dumped some apps and got to 3.2gb. Since switching to the 6s I have not added any apps nor photos. Question is, how have I used over 40gb in the change of phones?