Question: what is the difference between an iphone 6 and an iphone 6s?
Answer: The iPhone 6 and 6s both have a 4.7in display with a resolution of 1334 x 750 at 326ppi (pixels per inch), while the iPhone 6 Plus and iPhone 6s Plus have 1920 x 1080 pixel displays at 401ppi. The big difference is the inclusion of 3D Touch on the 6s models.