My wife and I got our new new droids friday, and we have been playing with them and really enjoing them. I'm trying to figure out every possible scenario on what needs to be turned off to preserve battery life. I am not exactly sure what wi-fi is, or why I need it. My phone gets great service. Rearely have I even been in a "hot spot" to my knowledge. If I don't need it, I'd rather just turn it off and back on when I do need it. Same goes for GPS. Do I really need GPS? I do still want to get emails and txt in real time, but I don't know what should be turned off and how it affects things on the phone service wise.