While many people are disappointed that Apple didn't release a redesigned version of its mobile device, the company's artificial intelligence feature Siri -- which is only available on the new iPhone 4S -- is so exceptional that it may convince those on the fence about upgrading their Apple smartphone to make the switch to the iPhone 4S.

Siri can be likened to a personal assistant. It lets users speak to their device and automatically deciphers their requests. Siri can be used to write and send a text, find a restaurant, tell you what the weather will be like, play music, make appointments, find directions and set location-based reminders.