IPhone 3GS is the successor to the iPhone 3G.
The iPhone 6S and 6S Plus were introduced on September 9, 2015, and included a more bend-resistant frame made of a stronger aluminum alloy, as well as a higher resolution 12-megapixel main camera capable of 4K video recording
 All iPhones include a rear-facing camera; the front-facing camera dates back to the iPhone 4

