I was using tata Docomo sim last one years. It was the best Internet service provider.
I am stay in metro city so that network coverage is very good, I have noticed rural areas there’s network quality is poor.
But tata Docomo calling charges is affordable means very cheap, they provide the best Internet speed also.
I am getting every day best offers like calling charges less, fully talk time offer, Internet service package is too much good and less rate like 3G service 2GB package at 139 Rs for the 28days.
If you want cheap net package then goto tata Docomo 123 service & select the 9 Rs 50 MB Internet pack for one day.
So I have recommended to buy this SIM used it for best service.