Does pixel shaders behave like vertex shaders when pixel light count is set to 0 from quality settings ?

I have some objects using pixel shaders in my scene and some vertex shaders. As I am planning to make an android game I wanted all my shaders to behave as vertex shaders. Does changing the value of pixel light count from quality settings to 0 makes the pixel shaders behave as vertex shaders?

I’m not sure what you mean by pixel shaders “behaving as” vertex shaders. vertex shadres and pixel shaders do different stuff, vertex shaders process vertex data from meshes you draw, pixel/fragment shaders process fragment data produced by the GPU resterizer. The code you write for a pixel shader runs at a pixel shader processor after the rasterization, it can’t run in the vertex processors, it uses different input data and produces different output data.