Re: iphone 4 just announced.
to jailbreak - yes
as for the battery, once every second day. Just turn any notifications off you aren't using, turn off wifi when you aren't using it, its constant searching eats battery. Push notifications on email are big on battery usage, and turn your brightness down to where you're happy with it. After i turned off notifications on a bunch of crap i never used, battery lasted a lot longer
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