Apple's 2018 iPhone XS sports a 5.8" 1125x2436 notch-type flexible AMOLED display (produced by Samsung Display), an Hexa-Core Apple A12 chipset, 4GB of RAM, 64/256/512 GB of storage and a 12MP camera. In addition to the iPhone XS, Apple also offers the larger iPhone XS Max with its 6.5" 1242x2688 flexible AMOLED.
The iPhone XS is now shipping globally starting at $999 (64GB model).
Display experts from DisplayMate rated the iPhone XS flexible AMOLED as the world's best mobile display, on par with the Galaxy S9 and Note 9 displays. Display Mate says that the AMOLED has a close to text-book perfect calibration and performance.
The OLED on the iPhone XS uses an LTPS backplane. Interestingly for the 2018 Apple Watch Series 4, Apple adopted its own patented LTPO backplane technology for the AMOLED displays. Low-Temperature Polycrystalline Oxide (LTPO) combines both LTPS TFTs and Oxide TFTs (IGZO, Indium Gallium Zinc Oxide). LTPO can be around 5-15% more efficient compared to the currently-used LTPS backplanes, but is more complicated to produce and may have a lower pixel density. See here for more information on LTPO. It will be interesting to see whether Apple will adopt LTPO in future iPhones as well.
5.8" 1125x2436 flexible AMOLED