I read several websites telling how to improve battery autonomy and limit data connection. I change the refresh period for mails, exchange, facebook and twitter. Disable the wifi and gsm location. Disable the weather update Disable the always on option Disable the google account auto refresh option I also try to kill all running application using task manager. But my problem is that the data connection is always on. How can I close it and let my hero connect a few second each hours according to the refresh period I configured?