Apple has finally revealed its next iPhone, the iPhone 4S. The company is, as would be expected, calling it âthe most amazing iPhone yet.â But what makes it better than the iPhone 4?

Apple fans worldwide might be disappointed that the new device does not live up to the mystique of the much speculated on iPhone 5, but the iPhone 4S is a dramatic leap forward in technological innovation and sophistication that will surprise mobile users, even current iPhone 4 owners.

Here are the four most significant reasons why someone would think the iPhone 4S is worth the price of upgrading. But if none of these speak to your inner gadget nerd, perhaps a free iPhone 3GS will do the trick.

Siri: Voice Activated Features

How does having your own personal assistant waiting for your every command sound? How about a helping hand that can look up the weather, read you text messages, find you nearby restaurants, tell you the time in Paris, set your alarm clock, give you directions, check your calendar for conflicting meetings, dictate and transcribe your notes and text messages, and so on, and all you have to do is ask?

Sounds fantastic, right? Well, thatâs Siri and itâs a personal assistant built in to the iPhone 4S. One of the coolest features is...