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Hartmus Esslinger invented the iphone.
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The Iphone 4 was released 3 years after the first iphone.
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the iphone 5 was released two years after the iphone 4.
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The iphone 5c was released 1 year after the iphone 5.
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The iphone 5c and 5s were released on the same date.
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the iphone 6 was released a year after the iphone 5s.
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The iphone 6s was released a year after the iphone 6.
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the iphone7 was released a year after the iphone 6s.