But the exploding battery problem was due to Samsung's design (or lack of proper engineering constraints for the battery size vs container). At least, that was my understanding of what happened.
With regard to India as a manufacturing location, I have read many reports that they have massive infrastructure insecurity - power blackouts, brownouts, and just an overall poor reliability for both power and transport.
Vietnam has a better infrastructure (power), or so I have read.
As to the 120 million Samsung phones being assembled in India...I think we've all read about the poor standards and implementations of Samsung manufacturing overall. I'm not saying that ALL Samsung phones would be of lower quality manufacturing, but their high-end phones (with the best manufacture constraints) are a very small portion of their inventory per year. The vast majority of their phones are cheap, lower-quality devices. Those I have no problem believing could be manufactured en masse in India.
I guess we'll see what happens, but for many reasons, China is not a safe or sound manufacturing resource moving forward. I hope that many worldwide companies rethink and relocate their manufacturing away from China to Vietnam and other countries. We in the West have become far too dependent upon China, and it has obviously backfired. Business strategies of short term profits with no regard for long-term implications (imbalance of power) have finally begun to dawn on the c-suite.