Worth a special mention is the Visual Voicemail. The application displays caller information and allows you to choose which message to play back instead of forcing you to hear messages in a sequential order.
Another nice touch is the inclusion of an accelerometer, as first seen in a Samsung Electronics mobile back at the start of 2005. The accelerometer detects when you rotate the iPhone from 
portrait to landscape, then automatically changes the contents of the display accordingly. This is great when viewing landscape photos or browsing the Internet. The feature has made it's way into other mobile phones, like the new Sony Ericsson K850i.
The inclusion of just a 2MP Digital Camera is slightly disappointing and actually below industry average in terms of today's 5MP technology on other similar sized gadgets. The quality is acceptable for blogging or desktop wallpaper, but you'd want more to consider printing your photographs. Note this is a photo camera only, bizarrely the iPhone doesn't let you record video. However, when it comes to playing videos just look at the specs.(see below), you will not be disappointed!
A number of power-saving feature have been built into the design of the iPhone. For example, when you lift the iPhone to your ear, a proximity sensor turns off the display to save power and prevent inadvertent touches until iPhone is moved away. Another power-saving feature is an ambient light sensor. This intelligent sensor automatically adjusts the display’s brightness to the appropriate level for the current ambient light. This feature has successfully tried and tested in many PDAs and laptops and some mobile phones like the Blackberry. These power-saving features all go towards helping to squeeze as much play time out of the non-removable battery as possible. Even so, expect to get around just 4-8hrs of use between charges when using the mobile phone (media player gives a much better performance).
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