I work from home. I notice that if I turn off "Mobile network: Connect to Internet', my battery life increases substantially. I would put the increase at over 100%, roughly from 8 hours to 16 hours. My phone uses my wifi network to keep all it's data functions going. I've noticed that the email updates in gmail and k9 happen far less frequently. The best way to force them to sync is to launch each app. Does turning off "Mobile Network" affect the sync intervals? I also have to wonder why the battery life is so greatly extended. I assumed that my phone would detect the wifi and not use the mobile internet functions. Is the power drain caused by keeping the radio on just in case I wander too far from my wireless router? Do other folks who shut off the Mobile Internet have the same increase in battery life/decrease in sync intervals? Is there some setting where I can keep the same email sync intervals even when Mobile Network is off? Phone: Non-rooted Evo 4G running AWD Launcher instead of Sense Thanks!