I have the iphone 5 for some days ow and i have the feeling the "time of usage" time is not correctly displayed. including music, i have used the iphone about 3 hours today without charging but when i came home it said i used the iphone 4 hours and 40 minutes. Ive checked, and thats just impossible. I have no idea how i can get a "real" non-falsified report. any ideas?