If I am at home for hours at a time, what benefits come with using WiFi on my Droid Eris instead of the mobile network? When home, I have computer access so speed is of no concern. I'm just wondering what the battery life difference is, if any. And now that I think about it, if I'm home I could just be charging my phone so even if WiFi saved battery life it wouldn't be any gain. WiFi seems to be such a desirable feature, but I have no idea how it benefits me. Please teach me something!