Let me start off by saying this is the coolest gadget I've ever bought. Having a screen this big is awesome, I don't think I could ever go back now. Only problem is, if there is a button I need to press at the top of the screen and I'm only using one hand, my thumb can't really reach it lol. But anyway I want to know a few things. 1. When I'm in class in the automotive building at my campus, I get zero signal. Yesterday morning I noticed the phone was getting pretty warm in my pocket. From when I took it off the charger at 6:30 AM, it had lost more than half its battery life by 10:30. After some digging I concluded that it was because it was constantly searching for a 3G signal. If I turned mobile network off while I'm in class, would this save the battery life? 2. Like above, does GPS also use a ton of battery life when there is no signal? I only have it on for the weather app and stuff like that, only updates every three hours. I have all the other auto-syncing crap turned off. 3. If I have wifi set not to notify me when there are new networks, does it drain the battery if I just leave wifi on even when I'm not connected? 4. Is there a widget or app that lets me control all of the audio settings from the home screen? It seems as if there's no easy access to this in Android. When I'm in class, I want everything to be on vibrate. When I'm at work, I want the ringer on vibrate and text messages on beep and vibrate. Any other time I want all the sounds on. 5. I need a car charger. Where is the best place to get a quality, cheap car charger? I went to best buy and all they had was universal shit. My friend got me one for my Vu, and it was terrible. The plug was very loose on the port. Sprint seems to charge like $35 for these which I think is ridiculous. 6. Cases... I don't really want one because of the added bulk, but I want to protect this thing no matter what. After reading around, I can pretty much tell that Otterbox cases are the best. HTC EVO 4G Cases // OtterBox.com But what is the difference between the Commuter and the Impact series? I want a case that adds minimal bulk while still protecting the phone. 7. I also want a screen protector. I have always taken very good care of my phones and rarely ever drop them or anything, but this phone is way too nice to take any chances. And I want to keep everyones greasy fingerprints off my screen when they play around with it haha. Where can I get cheap, good fitting screen protectors? Best buy was charging like $30 which I think is nuts for a sliver of plastic. 8. I just downloaded launcher pro and I haven't messed around with it too much, but what kind of cool shit can I do with this? Any tips? 9. Any other voodoo battery life tricks? I read the sticky in the tips and tricks section but are there any other good threads I missed? My phone shipped with 2.2 and battery life seems to vary greatly. I think that's all for now...lol. I'm sure there's more I'm forgetting but there is just so many settings and things you can do on this phone. I would greatly appreciate the help as this is my first Andriod phone.