iPhone 4g comes with the latest amazing new features that make it powerful, easier to use, and more beautiful than ever.  People have been dreaming about video calling for decades and 4g iPhone  makes it a reality. iphone 4g has two cameras: One on the front, which focuses on you and the other one on the back, which focuses on everything else. Face Time lets you switch back and forth between them at any time during a video call  with just a tap. It has three axis gyro with A-4 processor and Dual-mic noise suppression while these feature was not in iphone3.

Specifications

Display
•    High-resolution Retina display
•    960-by-640 resolution
•    326 ppi
•    Multi-Touch

Video Calling
Face Time –  It  makes  possible to talk, smile, wave, and laugh with anyone on an 4g iPhone , iPod touch, or Mac from your Mac over Wi-Fi.

Camera
•    5 megapixels
•    LED flash
•    Backside illumination sensor
•    Autofocus
•    Tap to focus
Front camera with VGA resolution

Video Recording
•    HD video recording
•    Tap to focus while recording
•    LED light

High Technology
•    Multi-Touch
•    802.11b/g/n Wi-Fi
•    7.2-Mbps HSDPA
•    5.8-Mbps HSUPA
•    GPS
•    Accelerometer
•    Three-axis gyro
•    Apple A4 processor
•    Dual-mic noise suppression
Battery life

Talk time:
Up to 7 hours on 3G;
up to 14 hours on 2G
Standby time:
Up to 300 hours
Internet use:
Up to 6 hours on 3G;
up to 10 hours on Wi-Fi
Audio playback:
Up to 40 hours
Video playback:
Up to 10 hours
Price

$199      16GB   iPhone4
$299      32GB   iPhone4

Both 16 and 32 GB iPhone4 have same features only the memory difference is their. Once you buy 16GB you can’t upgrade it to 32GB .So be specific before buy.

Specifications and Comparison with LG optimus 7