Since the upgrade to iOS 6.1, the battery of my iPhone 4 last less as 8 hours without charging.
I have seen, that the 3G is less stable and that the battery discharge much quicker when there is less or no network (gsm, edge or 3g).
Have you such experience ? What could I do to prevent that without plane (offline) mode ?
Same problem here.
Updated to 6.1 2 weeks ago.
Since yesterday battery is only lasting around 8 hours.
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