I'm sure i've written this somewhere before, but i want to echo two points again.
1) turn off BT & WIFI. If you are not specifically using either of these (ie- web browsing at home, downloading huge apps, etc), the network is plenty fast for whatever occasional data you have.
2) set to airplane mode if you have spotty or no coverage. the phone wastes a tremendous amount of power trying to connect to the network. In my office at work where i don't get a signal, my phone will last only 3 hours, instead of 9. BIG difference.
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