iPhone OS 1:hello there I am the first one iPhone OS 2:I am the second one iPhone OS 3:I am the last to have iPhone Os in my name iOS 4:I upgraded my name and emojis iOS 5:Hi 6:Hello I am the last one to include the skeuomorphic app icon 7:hello I am the first one to include the flat design we all know today but different 8:I upgraded my emojis with some new ones and new flags 9:I also include flags I am the last one to get the smile grimacing face 10:I am the first to get upgraded emojis 11:hi 12:hi 13:hi 14:hi 15:hi 16:hi 17:hi 18:hello