I was thinking is this happening only to me? I found out the answer to my question only when I got the similar issue with my colleague. Tata Docomo’s network has been down since late afternoon on June 20th 2013 to most of the Docomo subscribers. Subscribers are not able to make calls or receive calls.
The reason behind the network being down is still unknown. Hope we get the answer on the news channel soon. Until then we just have to wonder whats happening to our docomo’s network.