Which device do you have? I have a Vibrant and wifi calling will run in the background chewing up your battery. You cannot see it unless you use something like system monitor. If it is running use Taskkiller to shut it down. You will periodically need to shut it down because it will restart if you power off for some reason. While everything else helps, if wifi calling is running in the background you will not see much difference in battery power if you don't stop it.
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