Magazine : 
The Missing Features of iPhone 4S
Battery life is unchanged
The battery life of iPhone 4S is more or less same of the iPhone 4. But possibly this is a bit of an achievement on Apple?s part bearing in mind that the new phone has a faster processor, a more powerful camera, and additional features. The new phone provides eight hours of 3G talk time, six hours for 3G web browsing, and nine hours of Wi-Fi browsing. But strangely, the standby battery life has dropped to 200 hours from 300 hours for the iPhone 4.
iPhone 5 Round the Corner 
Why go for iPhone 4S, when the best is soon to come? You can get the latest next-generation iPhone soon. iPhone 5 is probable to be launched somewhere within the 6 months.
iPhone 5 Round the Corner
