Just got this phone about a week ago and have a few questions. 1. What's ROM stand for and what is it? 2. I've got a new ROM update from T-Mobile but when I run the install it says "This will wipe all your information and data". What's all that about? 3. Might be my router but when I enable WiFi and try to connect to it, it connects for a minute or so then disappears and then will come up shortly after saying "WiFi networks available" but it won't connect to the router. 4. Is it worth messing about with custom ROMs? 5. There's a battery issue, sometimes it will last ages and sometimes it won't last very long at all. I've heard Android keeps programs running after you've shut them down, so how do I close them properly?