My cousin had used Tata docomo a year ago. Tata docomo is a GSM type network . Tata docomo had launched by Tata indicom mobile operators . My cousin is very annoyed with Tata docomo because of many reasons . First reason is that my cousin first live in Meerut where tata docomo is available but when he shifted to Delhi for his studies he had noticed that Tata docomo is not available in Delhi because of which he had to Port his son form Tata docomo to other network . Second thing is that when he was in Meerut many times he was not able to call anyone it always saying that other person is busy which is not true . Third its internet runs very slow . That’s why I don’t like it