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The user interface is built around the device's multi-touch screen, including a virtual keyboard.The iPhone has Wi-Fi & cellular connectivity such as 2G, 3G, 4G <E. An iPhone can shoot video, take photos, play music, send & receive email, browse the web, send texts, & receive visual voice mail. Other functions are video games, reference works, GPS navigation, social networking, & etc.
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There are seven generations of iPhone models, each accompanied by one of the six major releases of IOS.
iPhone release dates- 1st gen: June 29, 2007
3G: July 11, 2008
3GS: June 19, 2009
4: June 24, 2010
4S: October 14, 2011
5: September 21, 2012
5C and 5S: September 20, 2013
Memory - 1st gen and 3G: 128 MB LPDDR DRAM ( 137 MHz)
3GS: 256 MB LPDDR2 DRAM (200 MHZ)
4: 512 MB LADDR2 DRAM (200 MHz)
4S: 512 MB LPDDR2 DRAM
5: 1 GB LPDDR2 DRAM
5S: 1GB LPDDR3 DRAM
Weight - 1st gen & 3GS: 135g (4.8 oz)
3G: 133g ( 4.7 oz)
4: 137g (4.8 oz)
4S: 140g (4.9 oz)
5: 112g (4.0 0z)
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Some online services also in iPhone such as iTunes Store, App Store, iCloud, iBooks, Passbook
If you want more details about iPhone, please visit- www.apple.com/iPhone