Directional lighting is supported on Mobile actually. You can only have one though, as it can be expensive, and it has to be set to Static or Stationary. Take a look over our Mobile Development documentation to get a better understanding of the limitations when developing for mobile.
Mobile Development - Lighting for Mobile Platforms
Point lights and Spot Lights only support Static mobility types, which means if you are spawning your lighting in at runtime, you are going to have issues as these need to be baked using lightmass.
Could you provide me with some screenshots or your scene?
Thank you,