Vodafone

Not used this service as they asked for security deposit even after having the connection over 12 years (2009)

Little better than Airtel

Worst service providers not only Vodafone, Airtel, BSNL, Idea all are sailing in same boat. They boast their services but are not up to the mark.
Some provider doing good in one Circle but fails in another. They are unable to provide Seamless connectivity uniformly in all Circles.

Worse service provider