The touch screen and gesture features of an iPhone are based on technology originally developed by Finger Works.
Most gloves and styli prevent the necessary electrical conductivity however, capacities styli can be used with iPhone's finger-touch.
The iPhone 3GS and later also feature a fingerprint-resistant oleo phobic coating.
The top and side of the iPhone 3GS, externally identical to the iPhone 3G.
From left to right, sides: wake/sleep button, SIM card slot, headphone jack, silence switch, volume controls.
The switches were black plastic on the original iPhone.
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