IPhone XS

The iPhone X S  (pronounced "ten-S") is a touchscreen slate smartphone designed and marketed by Apple Inc. It is an 18th generation iPhone, being the successor to the iPhone X and the predecessor to the iPhone 11 Pro.

Release
The iPhone X S and X S Max were introduced at Apple's iPhone event on September 12, 2018 by Apple CEO Tim Cook at the Steve Jobs Theater in Cupertino, California, alongside the iPhone X R, a lower-cost variant without the newer screen technology.

Features
The new features primarily consisted of a new faster 6-core Apple A12 Bionic processor, a 5.8 or 6.5-inch Super Retina display, updated Face ID, and an improved dual-camera system. The X S also adopted a 4x4 MIMO 4G antenna, doubling the maximum cellular bandwidth over that of the 2x2 antennae in the iPhone X and X R.

The iPhone X S was released with iOS 12 as its first operating system.

Trivia
The new additions made the iPhone X lineup the largest lineup of iPhones, tied with the iPhone 6 and iPhone 5 lineup. The 4 iPhones in the X lineup are:
 * iPhone X
 * iPhone X R
 * iPhone X S
 * iPhone X S Max

The iPhone X S and X S Max are the final iPhones to have the “S” suffix.