I have a Quad with a mobile diffuse material attached to it. Additionally, the gameObject is also lightmapped. The problem is that it is not showing on my iPad (mini with retina), but it is visible on the editor as well as on my Galaxy S4. Any ideas on how to fix this? Thanks 
I managed to fix it. Under the player settings, you have to set open gles 2.0/3.0 to automatic.