Apple iPhone 4

The iPhone 4 comes with a 5 megapixel camera on both the front and the back, no more shooting photos of yourself in front of a mirror, the camera easily switches from front screen to back screen view. With added 5x digital zoom, and a flash that can be turned off, this is one of the best phone cameras on the market today.

The video recording is now HD, and combined with Apple's iMovie or another app, high quality videos are at your fingertips. Another feature of the front screen and back screen camera option is Face Time, video conferencing that is as easy as making a phone call.

At the basis of all these improvements is Apple's move to the powerful and energy-efficient Apple A4 chip. The new IOS 4, which Apple calls "the most advanced mobile operating system in the world" brings with it several upgrades. These include multi-tasking, which, when combined with the faster app switching, makes every application on the iPhone easier to use. The added gyroscope feature offers all way motion sensors- the best thing in the world for gaming. iPhone 4 comes with folder options that are easily organized, re-organized and updated. Enhanced mail features along with many other features, big and small are included.

Saving the most awesome improvement for last, we come to the Retina Display. This updated display is super bright, crisp and completely pixel free. With 326 pixels per inch, the human eye is not capable of distinguishing pixels from any angle. The contrast is at a whopping 800:1 ratio, four times higher than previous iPhones.

This is the world's best selling smart phone for a reason.

Need to Know: Apple iPhone 4

1. A Retina Display provides amazing visuals, the crispest images on any cell phone. (The Good)

2. A 5 megapixel camera, with available flash and 5x digital zoom. (The Good)

3. Powered by what Apple calls "the world's fastest mobile processor". (The Good)

4. A 16GB model costs $649. Ouch! (The Bad)