Really very very bad network ever I seen. There is many mobile operator in India but some of them very bad. Just like them docomo also shows its quality. 1st of all its data pack is low rate data pack but it connection also like that. very bad quality network only in metro city just lie Kolkata , Delhi its signal is good but other area like village its has very poor signal.
Without any reason docomo mobile operator reduce your mobile balance and after claim it may come back or not. It is sooo funny.I dont know others opinion but mine is very bad Docomo mobile operator so dont go for it