Apple iPhone 4


The iPhone 4 is a touchscreen smartphone developed by Apple. It is the fourth generation of iPhone, and successor to the iPhone 3GS. It is particularly marketed for video calling.  The iPhone 4 runs Apple’s iOS operating system, the same operating system as used on previous iPhones, the iPad, and the iPod Touch. It is primarily controlled by a user’s fingertips on the multi-touch display, which is sensitive to fingertip contact.

The most noticeable difference between the iPhone 4 and its predecessors is the new design, which incorporates an uninsulated stainless steel frame that acts as the device’s antenna. The internal components of the device are situated between two panels of chemically strengthened aluminosilicate glass. It has an Apple A4 processor and 512 MB of eDRAM, twice that of its predecessor and four times that of the original iPhone. Its 3.5-inch (89 mm) LED backlit liquid crystal display with a 960×640 pixel resolution is marketed as the “Retina Display”.

Key features

  • Quad-band GSM and quad-band 3G support with 7.2 Mbps HSDPA and 5.76 Mbps HSUPA
  • 3.5″ 16M-color LED-backlit TFT capacitive touchscreen of 640 x 960 px resolution
  • Scratch-resistant glass front and rear, with fingerprint-resistant coating
  • 1GHz Apple A4 SoC; 512MB of RAM
  • 5 MP autofocus camera with LED flash and touch focus
  • 720p video recording at 30fps
  • Wi-Fi 802.11b/g/n
  • GPS with A-GPS connectivity; digital compass
  • 16/32GB storage options
  • Accelerometer, proximity sensor and three-axis gyro sensor
  • Active noise cancellation with a dedicated secondary microphone
  • Standard 3.5 mm audio jack, stereo Bluetooth v2.1
  • Excellent audio output quality
  • Slim waistline at only 9.3mm
  • Secondary front-facing camera
  • Some degree of multitasking
  • Rich AppStore

Main disadvantages

  • Hardware design is prone to reception issues
  • MicroSIM card support only
  • No Flash support in the web browser
  • No true multitasking for all applications
  • FaceTime video calls work only over Wi-Fi
  • No file transfer over Bluetooth or USB Mass Storage mode
  • No hardware shutter key for the camera
  • No FM radio
  • No stereo speakers
  • No microSD card slot
  • No smart dialing
  • Too dependent on iTunes for loading multimedia content
  • Poor loudspeaker performance
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