I have been customer of tata docomo since 5 years.Network of tata docomo service is, as all know, not so good. I have bought this sim card along with my friends, they all have ported to other network provider till now because of many network issues.Other companies providing many offers like daily 1 GB 4G internet, unlimited calling but tata docomo is lagging behind in term of providing such value adding offers.Also the offers tata docomo providing are too costly to activate for common user.So its better to port to other network or not to choose tata docomo