Why would "Exponential Height Fog" not working on mobile?

Development Platform & Builds Mobile
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1

We are developing a mobile game.

I would like to use “Exponential Height Fog” on Samsung Galaxy S3 or LG G Pro.

Why would “Exponential Height Fog” not working on mobile?

This is very important issue.

2

This was posted by a developer related to this question before.

Exponential Height fog should work on devices.

https://answers.unrealengine.com/questions/46612/mobile-fog-1.html