iPhone 4 is the new name of the Apple iPhone 4G phone which is regarded as the Apple’s next iPhone that  Steve Jobs announced during the WWDC (World Wide Developers Conference). According to Apple’s ads, this phone changes everything. Whether or not, you decide that for yourself.

* iPhone 4 Specs：

iPhone 4 Dimensions and Weight

The iPhone 4 is currently the thinnest smartphone on the market. The height of the iPhone 4 is 4.5 inches, width is 2.31 inches, depth is 0.37 inch and weight is 4.8 ounces.

     2.   iPhone 4 Colors

The iPhone 4 is available in both black and white colors.

     3.  iPhone 4 Battery Life

Battery life of iPhone 4 is up to 7 hours talktime，300 hours standby.Apple has put a larger battery in the new iPhone 4, which increases the battery life of the iPhone 4. Video playback is up to 10 hours and audio playback is up to 40 hours.

       4.     iPhone 4 Sensors

iPhone 4 has a Three-axis gyro, Accelerometer, Proximity sensor, and an Ambient light sensor.

      5.     iPhone 4 Buttons and Controls

There is the On/off, Sleep/wake button on the top right, Ring/silent button on the top left side, Volume up/down button on the top left side, and home button on the bottom front.

* iPhone 4 features:

FaceTime

FaceTime allows iPhone 4 users to video chat with another iPhone 4 user by taking advantage of the iPhone 4′s front facing camera or back camera, and this feature only works on WiFi. How to do? All you need to do is find your friend in the Contacts application, and tap on the FaceTime button to start a video call. FaceTime works in both portrait and landscape mode. You can also use either the front camera or the back camera of the iPhone 4 to have a video chat.

     2. Retina Display

Retina Display makes the iPhone 4 screen have a higher screen resolution. The iPhone 4 has the sharpest, most vibrant, and highest screen resolution in the smartphone market according to Apple. The reason is that the Retina display on the iPhone 4 uses IPS (in-plane switching) technology and has a 326 pixels per inch screen.

   3. 5-megapixels camera

The 5-megapixel camera allows users to record better quality videos and take better photos. The new iPhone 4 has a 5-megapixel, unlike the older iPhone 3GS that had a 3 mega-pixel camera. The camera on the back records in high definition, and has LED flash support.

* The new characteristics of iPhone 4

1. Front-facing video chat camera
2. Improved regular back-camera (the lens is quite noticeably larger than the iPhone 3GS)
3. Camera flash
4. Micro-SIM instead of standard SIM (like the iPad)
5. Split buttons for volume
6. Power, mute, and volume buttons are all metallic

* iPhone 4 Release Date

The iPhone 4 will be released on June 24. Pre-orders for iPhone 4 start on April 15. iPhone 4 will be available in 16 GB (9 with 2-year contract) and 32 GB (9 with 2-year contract).