References. [4] [5] The Pixel 4 and Pixel 4 XL are a pair of Android smartphones designed, developed, and marketed by Google as part of the Google Pixel product line. They collectively serve as the successors to the Pixel 3 and Pixel 3 XL. [6] [7] They were officially announced on October 15, 2019 at the Made by Google event and released in the .... "/>