Iphone 6s release date - iPhone 6S release date September 25th, prices start at $199 and $299 for 16GB

In the months following the launch, Apple saw its first-ever quarterly year-over-year decline in iPhone sales, attributed to a saturated smartphone market in Apple's biggest sales countries and consumers in developing countries not buying iPhones.

But as far as looks go, this extra shade is the extent of the changes you'll be able to visually detect between this year's and last year's phones.

It also uses the accelerometer to determine pressure levels with more accuracy.

To avoid their competitors discovering their category-defining innovation, Steve Jobs was adamant that no-one from outside the company could work on Project Purple.