Even the most modern, resource-efficient network in the world does not make it easy to break into a saturated mobile market with three heavily entrenched operators, as Rakuten Mobile is finding out. Free Mobile did it in France, but that was in a market where the existing MNOs had kept prices high and were slow to respond effectively to the newcomer. Reliance Jio disrupted the Indian landscape, but that was by providing extremely low cost services in a very cost-sensitive market, leveraging a low cost base and significant amounts of asset sharing. Rakuten took a leaf out of Jio’s book by offering free services to incentivize users to migrate to its service, but has so far had limited success. It…