My penis is a half inch bigger than an iPhone 4S and I'm 15?

Is that small, average, or big?

Some people like to use something called a ruler. You should try it.

Small.very small.

Dude it's ok it's good nuff and how come its jumping for 5 to 6 to 4 I mean sorry if its wade from Xbox

How long is the iphone?

As I have not the slightest idea of the size of those items I can't give you a definitive answer. Have you never heard of a ruler or tape measure ~