I don't know who's that insane to leave mobile internet on for all day .
Me, for one. My whole point of getting the handset was to have a "connected device" so it's never switched off, along with wireless-based location and periodic Twitter/NewsRob/Gmail refreshes. Data usage for these 'core' functions never exceeds a couple of MB/day. If I'd wanted dumbphone levels of battery usage I'd have bought a dumbphone.
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