https://www.cnet.com/news/google-thinks-pixel-3-one-rear-camera-will-beat-samsungs-four/

Samsung's Galaxy A9 comes out swinging with four rear cameras.

Phone-makers have been known to reserve a second lens for the more high-end model of a set. For example, the Galaxy S9 and iPhone XR have single lenses, while the Galaxy S9 Plus and iPhone XS have two each. But Google's Pixel 3 and larger Pixel 3 XL share the exact same 12.2-megapixel sensor. There's no camera advantage to buying "bigger". It's also worth noting that the Pixel 3 and Pixel 3 XL both have two 8-megapixel front-facing cameras, but I'll get to that later.