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Steve jobs introduced the first iPhone comes out with a multi touch glass display,came with 6 to 8 GB storage and had internet access
http://time.com/2934526/apple-iphone-timeline/ -
the iPhone 3g came with a 20% longer lasting battery,weighted less than its older brothers with a tough plastic fram, came with more storage,and had GPS
http://www.everymac.com/systems/apple/iphone/iphone-faq/differences-between-the-original-iphone-and-iphone-3g.html -
it came out with a steel frame on the sides with, a 15% loner battery life, a high resolution camera and updated version of ios 4
http://www.everymac.com/systems/apple/iphone/iphone-faq/differences-between-iphone-4-iphone-3gs.html -
the iPhone 4s was significantly more advanced that the iPhone 4 with a faster processor , a 8 megapixel camera, with a 1080p video camera compared to the 720p on the iPhone 4, and a longer last battery http://www.everymac.com/systems/apple/iphone/iphone-faq/differences-between-iphone-4s-iphone-4.html
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the iPhone 5 had twice the dual core speed than the iPhone 4s with a 1.3 GHz, had a GB RAM compared to the iPhone 4s's 512MB RAM, a much tougher and lighter aluminum fame than its steel counter part and a much larger screen.
http://www.everymac.com/systems/apple/iphone/iphone-faq/differences-between-iphone-5-iphone-4s-iphone-4.html -
it came with the new id touch which allows you to open up your phone with your fingerprint,a glare resistant camrea,and came with a 11% longer lasting battery
http://www.everymac.com/systems/apple/iphone/iphone-faq/differences-between-iphone-5c-iphone-5s-iphone-5.html -
when the iPhone 5c came out it came out with little to no changes at all besides it being cheaper and having bright fruity colors
http://ipod.about.com/od/iPhone5SandiPhone5C/tp/Differences-Between-Iphone-5s-Iphone-5c.htm -
when it was revealed it came with a much larger screen , also with ios 10 unlike the 5,5c,5s's ios 8,9 and with a rounded frame making it stronger overall.
http://www.everymac.com/systems/apple/iphone/iphone-faq/differences-between-iphone-5-5c-5s-iphone-6-6-plus.html
