The iPod Touch and the iPhone share the same hardware platform and are controlled by the same iPhone OS operating system. The iPod Touch lacks some of the iPhone's features such as: access to a phone network, a built-in microphone, a camera, Bluetooth capability, and GPS receiver; as a result, the iPod Touch is slimmer and lighter than the iPhone. Steve Jobs has referred to the iPod Touch as "training wheels for the iPhone".[8]
The second generation iPod Touch has an external volume switch and a built-in speaker, like the iPhone. The second generation also comes with the chrome frame seen on the iPhone 3G, making the two almost identical when viewed from the front. However, there are some notable differences, as there is no speaker above the screen, no silent/ringer switch, and the sleep/wake button is on the other side. The second generation also supports audio input when a headphone or earphone with microphone capabilities is plugged into the audio output jack. Although unannounced and unsupported by Apple, the iPod Touch has Bluetooth capability, as the included Wi-Fi chip (Broadcom BCM4325) has Bluetooth and FM Radio support, as well as the advertised Wi-Fi capability.[9] It is believed that this Bluetooth capability is being used for Nike+iPod support, as Apple has said that the Nike+iPod kit works on an unspecified 2.4 GHz radio frequency.
Second generation iPod Touches are said to have a yellower cast/tint to the display, as compared to the iPhone or the original iPod Touch.[10] Claims have also been made that the applications processor inside the second generation iPod Touch runs faster than the processor inside the iPhone 3G.[11][12] The first generation iPod Touch works with all "Made for iPod" peripherals, but certain changes that Apple made to the second generation iPod Touch prevent some existing peripherals from recharging the updated player.[13]
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