3D looks pixelated-y and low quality

Unity Engine
1

I have this pixelated 3D tiles and im wondering why is it like that…
Is this kind of problem common?
How can make my 3D model seems pixel perfect?
I tried changing the shaders but it still looks the same. It looks bad, specially on mobile devices…
Thanks!

2212240--147140--pixalated.png

2

How do you render 3d tiles?
If every tile is a 3d mesh (a cube), then you need to use antialiasing (MSAA or FXAA)