I think I figured out why I get such bad battery life. When I am at work inside the office my signal is at best between 1 bar and SOS all the time. I think the constant switching back and forth from no signal to signal is draining the life out of my phone. So today I tried turning off my signal while I was at work and my phone lasted all day. Plus I noticed when the phone is on SOS, it is running off a different network. When you go to service status and look at the Mobile Network Provider it says AT&T in my case.