Read the TRAI consultation paper on MVNOs in India (thanks to contentsutra).
Decent thoughts there. Nothing great though 
including some screenshots from the paper I think that are decent. For someone who has no idea on MVNOs the paper does a good job … The paper talks about how the licenses have been distributed as of now and then examines situations all over the world in terms of MVNO (lovely compilation). And yeah, there will be some entry barriers (cost and criteria) on MVNOs for sure I think!
Thanks for your thread and List of MVNO in Different Countries.Nice Post
Rahul
nice work