Tata docomo is the worst mobile operator according to me. I am using this mobile network since one year and I am not at all satisfied with this.
This operator still has 2g networks in uttar pradesh it has yet not upgraded to 3g network and nowadays nobody can use 2g network when we have many other options like airtel, vodafone, etc. as they give 3g and 4g internet speed at same cost.Networks are more often lost when we go from one place to another.