This has been frustrating me. I got the last minor update from Sprint (18mb, added the McAfee app) last week and ever since I have no background data on 3G. WiFi is fine, 3G is a no go. I have checked all settings, reset the network settings, factory reset the phone and nothing helps. Sprint is no help of course, they don't even seem to understand what background data means. I get no push notifications, if I am installing an app from the Play Store, I have to leave the Play Store app open or it stops downloading. I guess I will have to push for a replacement device, but I don't understand what this update did to cause this.