I m using tata docomo for about 3 monts and now I m looking foward for any other good sim.The network is not at all good, the sound of the other end cuts a lot.The network is the worst.The internet connection is also very weak, the avalibility of the net connection is not everywhere.The customer service of this sim is just an average type of service.The cost of the sim is just 80( INR) .This is the worst sim ever experienced, I m not at all satisfied with it and I guess even BSNL sims are better than tata docomo sims.