I have used tata docomo 2G network for about a year and during the first couple of months the network worked just fine but the problem started to occur gradually. Where other operators have a good signal, docomo struggled to manage to make a call or message. The 2G speeds were also not good, getting just 2-5 Kbps making it unusable for Internet. Thus I decided to discard docomo and never to fall into the trap of cheap services.