Siri is one of the major selling points of the iPhone 4S. The voice-activated personal assistant isn't available on the iPhone 4, iPad 2, or any other Apple device, despite people hacking older devices to run it just fine. And that won't be changing anytime soon.

Ever since the iPhone 4S and iOS 5 have been released, there have been widespread complaints about the iPhone's dismal battery life, especially on the latest model. Apple appears to have finally figured out the issue, as a new software update is coming soon to fix the power-hungry problem.

Many owners of the iPhone 4S are complaining about very short battery life, with their fancy new smartphones sucking down the juice like it's going out of style. The good news is that Apple is aware of the problem. The bad news is that they have no idea what's causing it.

Pretty much every device you can buy with a satellite navigation function, relies on the U.S. built GPS network for coverage. But now this monopoly is being challenged by similar systems created by other countries. The latest iPhone 4S works on the GPS system just like other smartphones, but it also supports the Russian GLONASS network as a secondary system.