After the update, the battery life on this phone got pretty bad. Not being able to turn off background data is one of the reasons I think, but how ICS uses wifi is probably the biggest reason. I searched the internet for answers on how to turn it off and found that if you go to 'menu' -> 'settings' -> 'wifi' -> 'advanced' -> uncheck 'notify me when a network is available'.. it stops wifi from constantly scanning. BUT that option is greyed out, so I can't deselect it! Has anyone else encountered this problem?