The original iPhone: Apple redefined the mobile phone.
Iphone 3g: the phone you've been waiting for.
IPhone 3GS: the fastest mobile phone so far
IPhone 4: Very changed, very wow (that's how it changes everything)
Iphone 4s: the most amazing so far (the most amazing so far)
IPhone 5: by far the biggest (by far the biggest)
IPhone 5s: thinking forward
Iphone 5c: colors, colors, and then more colors (just so colorful)
Iphone 6/6 plus: bigger (not just bigger)