Camera makers routinely rate the f-stop numbers on lenses at the equivalent value for a full frame camera. Thus an M4/3 camera with what Panasonic or Olympus claims to be a f/2.8 lens will perform more like a f/5.6 because Panasonic and Olympus both fail to mention they are using full frame equivalents that are not rescaled for the much smaller M4/3 sensor. It is blatant, false advertising. If Amazon claims this phone has an f/2.0 aperture lens they are lying. It might perform slightly better than other phones in low light, but not much and mostly it will be because of software within the phone that is aggressively post processing the image. It damn sure isn't because that tiny aperture lets in gobs of light--it doesn't, it can't. To truly perform well in low light the phone would have to have a huge lens and it certainly wouldn't fit in your pocket if it did.