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iPhone 4 Review

• Screen
  
• Retina screen
  
• 3.5-inch (diagonal) widescreen multi-touch display
  
• 960-by-640-pixel resolution at 326 ppi
  
• Contrast ratio (typical)
  
• 500 cd/m2 max brightness (typical)
  
• Fingerprint-resistant oleophobic coating on front and back
  
• Support for diplaying multiple languages and characters simultaneously
  

Cellular and wireless Camera, photos and videoLocationPower and batteryMac system requirementsAudio Playback

• GSM model: (850, 900, 1900, 2100 MHz); UMTS/HSDPA/HSUPA GSM/EDGE (850, 900, 1800, 1900 MHz)
  
• CDMA model: CDMA EV-DO Rev A (800, 1900 MHz)
  
• 802.11 b/g/n Wi-Fi (802 .11n 2.4 GHz only)
  
• Bluetooth 2.1 + EDR wireless technology
  

• Video recording, HD (720 p) up to 30 frames per second with sound
  
• 5-megapixel camera still
  
• VGA-quality photos and video at up to 30 frames per second with the front of the camera
  
• Tap to focus video or still images
  
• LED flash
  
• Photo and video geotagging

• Frequency range: 20 Hz to 20,000 Hz
  
• Supported audio formats: AAC (8 to 320 Kbps), protected AAC (from iTunes Store), he-AAC, MP3 (8 to 320 Kbps), MP3 VBR, audible (formats 2, 3, 4, audible Enhanced Audio, AAX and AAX +), Apple Lossless, AIFF and WAV
  
• User-configurable maximum volume limit

• Assisted GPS
  
• Digital compass
  
• Wi-Fi
  
• Cellular

• Built-in rechargeable lithium-ion battery
  
• Charging via USB to computer system or power adapter
  
• Talk Time:
  

  
  

  Up to 7 hours on 3 G
  

  up to 14 hours on 2 G (GSM model only)

  
  
• Standby time: up to 300 hours
  
• Use of the Internet:
  

  
  

  Up to 6 hours on 3 G
  

  up to 10 hours on Wi-Fi

  
  
• Video playback: up to 10 hours
  
• Audio playback: up to 40 hours

• Mac computer with USB 2.0 port
  
• Mac OS X v 10.5.8 or later
  
• iTunes 10.1 or later (free download from www.itunes.com/download)
  
• iTunes Store account
  
• Internet Access