Features-4

OS X

Apple has confirmed an optimized version of the Mac OS X operating system (without unnecessary components) will run on the iPhone, although differences between the operating system (OS X) running on Macs and the iPhone have not been officially explained.
It takes up around 700 MB.[33] It will be capable of supporting as-yet undetermined bundled and future applications from Apple.

Apple intends to offer a smooth method for updating the iPhone's operating system, in a similar fashion to the way that Mac OS X and iPods are updated, and touts this as an advantage compared to other cell phones.[34]

Widgets, similar to the ones available in Mac OS X v10.4's Dashboard, are included on the iPhone. They include Stocks and Weather widgets.

The iPhone's version of OS X includes the software component "Core Animation" which is responsible for the smooth animations used in its user interface. Core Animation has not yet been released for Macs, but will be part of Mac OS X v10.5.

Applications

The phone has several applications located at iPhone's "Home" Screen, including YouTube. It will stream the videos over Wi-Fi and/or EDGE after encoding them using QuickTime's H.264 codec, to which YouTube has converted about 10,000 videos. They are expected to convert the entire catalog by Fall 2007, implying that the YouTube application on iPhone will initially only be able to view a certain selection of videos from the site.[citation needed]
At the WWDC 2007 Conference on June 11th, 2007 Apple, Inc. announced that the iPhone will support third party applications via the Safari web browser. The applications must be created in Ajax or JavaScript to maintain device security.[35]

Other

The iPhone features a built-in battery that is not intended to be user-replaceable, similar to existing iPods. The battery is stated to be capable of providing up to seven hours of video, six hours of web browsing, or eight hours of talk time (depending on configuration). The battery life for music playing is stated to be 24 hours.[29] The battery will also allow for up to 250 hours of standby time.

There will be new headphones which are similar to those of current iPods, but which incorporate a microphone. Calls can be answered and ended by squeezing the microphone. The 3.5 mm TRS connector for the headphones is located on the top left corner (as seen from front upright). Wireless earpieces that use Bluetooth technology to communicate with the iPhone will be sold separately.

The loudspeaker is used both for handsfree operations and media playback.
The SIM card is located in a slot at the top of the device.[28]