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The new sleek Apple iPhone 4 comes in two versions of 16 GB and 32 GB with a flat glass rear which provides more resistivity to scratches than plastic. It's the thinnest smart phone in the market with an industrial, business like appearance. It is surrounded by a steel band which split into two. One part acts as antennas for the Wi-Fi, GPS and Bluetooth and the other part is used for receiving mobile network signals. The phone has a spectacular display called the retina display with a 960×640 pixel display resolution.

The apple iPhone 4 comes with iOS4 operating system which allows multitasking. For example, webpages can load in the background when the user is busy doing something else. User can shift between applications without losing data. The device has a high resolution camera of 5 megapixels and works with a LED photo light. The camera has a super-fast shutter screen, which is capable of taking high definition video of 30 frames per second at a resolution of 720p.

Technical specifications
Apple iPhone 4 is a Smartphone with GPS and is available in Black and in White. It measures 59x115x9 mm and a weighs about 137g. It has a GPS receiver and can be connected to other devices using Bluetooth and Wi-Fi or USB port. It is a quad band phone at works on GSM frequencies of 850, 900, 1800, 1900 MHz. Additionally 3G frequencies are also supported in north America and Europe.

SMS and MMS services are built-in along with emailing facility and internet browser. MP3, MP3 VBR, WAV, AAC music formats are supported. It has a headphone socket of 3.5 mm. The main screen for display is 50x76mm (WxH) with a resolution of 649×960 pixels.

The Good
The screen resolution is extraordinarily high with an improved email handling device. The battery life is long and the Apple iPhone 4 is easy to use. It has super speed and provides multitasking with an excellent camera.

The Bad
The video calling works only with Wi-Fi connection. When the phone is held in a particular way the signal drops. The price is on the higher side and it is tied to proprietary software like iTunes.

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Source: http://ezinearticles.com/?The-Best-Wifi-Mobile-Phone-in-the-Market—Apple-iPhone-4&id=5066285