It is simply the "new" antenna of the iphone 4. The automatic switch crap it does when locating the best signal. That has to be it. My wife's regular iphone 4 doesn't have this problem. She still has the choice to choose between 3G and edge, which the iphone 4s no longer has that luxury. That's why all that other crap isn't working (location services, icloud, wifi) I mean FFS SHE has all that stuff on too!. It all boils down to the differences in the iphone 4 and the 4s. So what are the differences? -SIRI -New Antenna (With automatic switching - "worldphone" ) -camera -A5 Chip Well, its not siri, its not the camera -- so that leaves the A5 chip, and the new antenna. Hmmmm but whats that you say? Some people don't have BATTERY problems at ALL? Well i think that safely rules out the A5 chip, and then points the finger to the antenna. I can safely think that its about the coverage (whether good or bad) in your area. The 4s's antenna is "working its magic" to find you the best signal constantly -- since now there is no feature to enable/disable 3G. That's why the iphone 4 doesn't have this problem, and thats why battery life differs amongst different people.