Should the S be a capital letter in the iPhone S series?

Question

For the iPhone S series, should the S next to the number be a capital letter or not? (iPhone 6s or iPhone 6S.)

Answer 1

On the official Apple site it's always written with small "s".

You can also use iPhone 6🅂 ;)

Answer 2

Going to http://www.apple.com/iphone-6s/ and scrolling until you can find a reference in the regular text on the page finds the s is not capitalized.