Hi there, I am the user of MTNL Braodband service since it's inception. In my opinion it's one of the best internet service in India. The speed is excellent, the downtime almost negligible and the experience is great.
The only downfall is their Customer Support. It's not that they do not attend properly. The reason is that the Suport staff often remains very busy. Actually it takes an average 10 to 15 minutes before I can talk to their representative. However, in view of the minimum downtime, I don't require to talk to them often, it's one of the best internet service. Highly recommended.
Regards
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