iPhone4 Or iPhone 3GS

iPhone 4

• Display  High-resolution Retina display, 960-by-640 resolution, 326 ppi, Multi-Touch.
• Video Calling,  FaceTime. 
• Camera 5 megapixels, LED flash, Backside illumination sensor, Autofocus, Tap to focus, Front camera VGA resolution. 
• Video Recording, HD video recording, Tap to focus while recording, LED light. 
• High Technology, Multi-Touch, 802.11b/g/n Wi-Fi3, GPS, Accelerometer, Three-axis gyro, Apple A4 chip, Dual-mic noise suppression. 
• Price $199 for 16GB, $299 for 32GB.

iPhone 3GS

• Display, 480-by-320 resolution, 163 ppi, Multi-Touch. 
• Camera, 3 megapixels, Autofocus, Tap to focus.
• Video Recording, VGA video recording.
• High Technology, Multi-Touch, 802.11b/g Wi-Fi, GPS, Accelerometer. 
• Price $49 for 8GB