I have been having this battery drain issue since moving to OS 4.0. Just wondering if this lock with a circle icon has anything to do with it. My location services is off and has not been on for past 24 hours. There was some reference to a location icon on some web articles but my GPS is off. Ideas?
That is the orientation lock for the screen. Double tap the home button, this opens the multi task screen. Now slide from left to right, you will see ipod controls and a symbol to the left of the controls. That locks and unlocks the screen.