We have stock Android 4.3 running on my wife's gsm Galaxy Nexus on Straight Talk and my (recently acquiured) Sprint Galaxy Nexus on RingPlus. I have a couple of questions: There is a widget that turns WiFi on and off, adjust screen intensity, etc. What does the circular icon in the center do? I know many custom ROMs allow you to set the number of home screens and maybe select which screen is selected when the Home button is pushed. Is there a feature like this in Android 4.3? Now I have a tough one. My RingPlus plan is free, but once you go over the very small data allowance it is charged by the MB. Therefore, I want to keep mobile data disabled except when needed. I also have the paid app Juice Defender Ultimate which is supposed to save battery power. Has anyone figured out how to conserve battery power with this app and at the same time only allow mobile data to be enabled when actually needed? Update: I figured out the center icon. It's the gps satellite. The trick was searching on the proper name of this widget ie, power control.