Just installed the Kit Kat update on my phone 2 days ago. Have not noticed any benefit to it. Actually, it has increased my battery usage by about 3 times. This is not good. My understanding is you can't roll back an update. I guess I have to wait for a patch. Also,yes, I have tweaked everything in settings. I did a Factory reset as well. Nothing seems to help. Pretty annoying. I' ve only had the phone 2 months. Never mind. Any ideas? Thanks.