? Front-facing video chat camera (Àü¸é Ä«¸Þ¶ó)
? Improved regular back-camera (the lens is quite noticeably larger than the iPhone 3GS) (Ä«¸Þ¶ó ¼º´ÉÇâ»ó)
? Camera flash(Ç÷¡½¬ ÀåÂø)
? Micro-SIM instead of standard SIM (like the iPad) (¸¶ÀÌÅ©·Î ½ÉÄ«µå)
? Improved display. It's unclear if it's the 960x640 display thrown around before?it certainly looks like it, with the "Connect to iTunes" screen displaying much higher resolution than on a 3GS. (µð½ºÇ÷¹ÀÌ ¼º´É Çâ»ó)
? What looks to be a secondary mic for noise cancellation, at the top, next to the headphone jack(³ëÀÌÁî Á¦°Å±â´É)
? Split buttons for volume(º¼·ý¹öÆ°ÀÇ ºÐ¸®)
? Power, mute, and volume buttons are all metallic(¸ÞÅ»ÀçÁúÀÇ ¹öÆ°µé)
? The back is entirely flat, made of either glass (more likely) or ceramic or shiny plastic in order for the cell signal to poke through. Tapping on the back makes a more hollow and higher pitched sound compared to tapping on the glass on the front/screen, but that could just be the orientation of components inside making for a different sound
? An aluminum border going completely around the outside
? Slightly smaller screen than the 3GS (but seemingly higher resolution)
? Everything is more squared off
? 3 grams heavier
? 16% Larger battery
? Internals components are shrunken, miniaturized and reduced to make room for the larger battery
_from gizmodo