Most modern high-end mobile phones now have multiple cameras.
With mobile phones though, this isnt really possible.
With these two cameras, the phone can switch between them allowing a larger range of optical zoom options.
With multiple cameras, these zoom ranges are designed to intersect to allow a smooth handover.
A wide-angle lens has also seen more use recently allowing phones to zoom out further to capture wider scenes.
There is much more vertical space within a phone that can be used for camera optics.
This is generally advertised and used as a way to enhance photos of people and selfies.
The ability to use multiple cameras to estimate the distance to items is also useful for augmented reality applications.
