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Took this last night.... It says about 7 hours of usage but it was mostly music and just light 3g browsing and around 20 texts? Few phone calls. just basic light use. not really happy at this.
I charged it to 100 percent and then I took it off the charger and left it on to see how the standby would be. I have most location services off, ping off, bluetooth off, wifi off, wifi sync off, brightness low, most icloud stuff off, mail is on fetch, time zone off, location iads off, and diagnostics and usage off. Basically I turned off most things that people advised turning off. Woke up at around 7am and the battery was at 72% -_-;; So as of now I deleted my mail and readded them I'll see how it does later on.
Edit: I have the 32gb black iPhone 4s on sprint