I used Tata Docomo while I was in class 12. I didn’t like this operator and still started using it because they used to give good night offers and my girlfriend bought me this sim card. I had no other choice but to use it.
The network coverage is a nightmare. I still remember that at 1 am at night I used to go to the roof to talk to her because of the pathetic network. I live in Kolkata and there is no good network and in remote places there is absolutely no network coverage. The customer service is even worse. They are not polite and trustworthy.
There are frequent chances of cross connections and call drops. I wouldn’t recommend it to anyone.