Hear is the some of the specifications that i find best regarding the iphone

video playback

Video formats supported: H.264 video, up to 1.5 Mbps, 640 by 480 pixels, 30 frames per second, Low-Complexity version of the H.264 Baseline Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; H.264 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Baseline Profile up to Level 3.0 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats

Size and weight

Height:          4.5 inches (115.5 mm)
Width:           2.4 inches (62.1 mm)
Depth:           0.48 inch (12.3 mm)
Weight:         4.8 ounces (135 grams)

Cellular and wireless

• UMTS/HSDPA (850, 1900, 2100 MHz)
• GSM/EDGE (850, 900, 1800, 1900 MHz)
• Wi-Fi (802.11b/g)
• Bluetooth 2.1 + EDR

Color

Black or white

Display

• 3.5-inch (diagonal) widescreen Multi-Touch display
• 480-by-320-pixel resolution at 163 ppi
• Fingerprint-resistant oleophobic coating
• Support for display of multiple languages and characters simultaneously

External buttons and controls

These are the very main technical specifications of the apple.

Source:  apple and my brain