Let's know iPhone 4 more

Steve Jobs unveiled the iPhone 4, at WWDC on Monday. Here's what you need to know:

1. Design

• 9.3mm thick; 24% thinner than 3GS
• Stainless steel exterior band is an integrated antenna
• lass front AND rear

2. "Retina Display"

• 325 "ppi" (apparently they are above "dots" now)
• 3.5-inch; same as before
• 800:1 contrast ratio; 4x better than 3GS
• Not OLED; claimed that you can't make an OLED with high enough resolution

3. Apple A4 Chip + Bigger Battery

• Claiming 40% more talk time, 300 hours of standby
• Quadband HSDPA/HSUPA

4. Gyroscope

• Adds three axis for pitch roll and yaw, giving a total of 6 axis with existing accelerometer
• New "CoreMotion" API's for making use of motion tracking

5. Camera -- Backside

• 5 Megapixel
• LED Flash
• HD Video; 720p, 30fps
• Built in video editing with iMovie

6. Front Camera and Video Conferencing

• For use with new "FaceTime" video conferencing tools
• WiFi only (said that is "for now" -- Apple will work with carriers)
• iPhone 4 to iPhone 4 only

7. iOS4 -- new name for the OS

• Free upgrade for existing devices on June 21
• Multi-tasking
• Folders
• iBooks for the iPhone

8. Green Cred

• Recyclable
• Produced without most of the nastier materials