The iPhone XS and iPhone XS Max (stylized and marketed as iPhone Xs and iPhone Xs Max; Roman numeral "X" pronounced "ten") are smartphones designed, developed and marketed by Apple Inc. They are the twelfth-generation flagships of the iPhone, succeeding the iPhone X. Apple CEO Tim Cook announced the devices alongside a lower-end model, the iPhone XR, on September 12, 2018, at the Steve Jobs Theater at Apple Park. Pre-orders began on September 14, 2018, and the devices went on sale on September 21.
Improvements besides increased computing speeds include dual-SIM support, filming with stereo audio, and strengthened water resistance.
The XS Max was the first plus-sized iPhone to have the newer reduced bezel form factor, as the iPhone X did not have a larger variant. Apple no longer sells the iPhone XS and XS Max as well as the iPhone 7 and its Plus variant as of September 10, 2019, after the iPhone 11 and 11 Pro announcement.
The iPhone XS has a design visually near-identical to the iPhone X but includes upgraded hardware, featuring the A12 Bionic chip built with a 7 nm process. It also features a 5.85 inch (149 mm) OLED display (marketed as 5.8 inch) with a 2436x1125 resolution at 458 ppi and contains dual 12-megapixel rear cameras and one 7-megapixel front-facing camera. The iPhone XS Max features the same hardware and cameras, but has a larger 6.46 inch (164 mm) OLED display (marketed as 6.5 inch) 2688 x 1242 resolution at 458 ppi and battery (3,174mAh). It was also noted by the media that the XS received a smaller battery than that of the X (dropping to 2,658 mAh from 2,716 mAh). The XS' battery is a new single-cell L-shaped battery, while the iPhone XS Max battery remains two cells like the iPhone X. Additionally, Apple states that the iPhone XS lasts up to 30 minutes longer than iPhone X, while the iPhone XS Max lasts up to 1.5 hours longer than iPhone X.