Before iOS 5, the only way to snap a photo with your iPhone was to tap the onscreen shutter button--always a somewhat awkward maneuver. But with iOS 5, Apple transformed the volume-up button into a shutter release, thereby making iPhone photography feel a bit more natural.
Just one problem: when you flip your phone around so the volume-up button is facing up, you end up with upside-down photos and videos.
The fix is inverted!
The remedy is fairly straightforward: keep the iPhone "right-side up" when snapping photos or recording videos--meaning with the volume buttons pointed down. You can still use the volume-up button as a shutter release.
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You may also wish to check this Apple Support page: http://support.apple.com/kb/TS4180Â
If you already have a lot of upside-down media, there are plenty of image utilities (like Advanced Batch Converter) that can batch-rotate photos.