Designed and marketed by Apple, iPhone is an Internet enabled multimedia smartphone. It is combined with a wireless internet device and an ipod along with mobile phone capabilities into one product. It also includes a 3.5-inch multi touch screen (with unusually high resolution (160 pixels per inch) rather than a keyboard which can be managed by users by using two finger touches. It carries 8 hours of life in the internal li-lion battery for talking or video recording/playback and it also gives a 24 hours battery life for music mode. It comes with either a 4 GB or 8 GB hard drive, an Intel CPU and Apple’s OS X operating system, modified for mobile appliance. iPhone comes preloaded with a suite media softwares and communications software, including iTunes and the Safari Web browser and iPhoto which can be used with in combination with the 2 megapixel camera on the back of the device. It’s an extremely thin phone (11.6 millimeters thick) but wider than another comparable devices. You may not know but your iPhone is smart enough to be compatible with Microsoft windows operating system including the latest Vista! It has got several networking features like: It can automatically detect WiFi networks Support for the 802.11b and 802.11g standards The uses quadband GSM and SIM cards to access cellular networks It supports EDGE for high-speed data transfer where available. It also has Bluetooth connectivity for short range networking with peripherals, other iPhones and PCs. Users can also view videos of YouTube on the device, along with Microsoft Office documents and most imaging formats, including .JPEG, .GIF, and .TIFF. Apple’s partnership with yahoo allows iPhone users to send and receive right HTML email. The It has a is a 9 cm (3.5 in) liquid crystal display (320×480 px at 6.3 px/mm, 160 ppi, HVGA) with scratch-resistant glass, that can render 262,144 colors. The display responds to three sensors. Proximity sensor deactivates the display and touchscreen when the device is brought near the face during a call. This is done to save battery power and to prevent inadvertent inputs from the user’s face and ears. An ambient light sensor adjusts the display brightness that in turn saves battery power. The iPhone contains three physical switches on the sides: wake/sleep, volume up/down, and ringer on/off. These are made of plastic on the original phone and are made of metal in the later models. A single button is present on the face of the iPhone below the touchscreen which brings the main menu when pressed. There are two loudspeakers- one above the screen as an earpiece and the other one on the left-hand side of the bottom of the unit. The volume controls are located on the leftside of the unit. Although iPhone is compatible with normal headphones, Apple provides a headset with extra functionality. It has an internal rechargeable battery like an ipod but the battery cannot be replaced unlike most other cellphones.