I used DoCoMo from last 4 years. Tata DoCoMo network is very poor when you roaming from your location to another location by train specially. But its a1st service provider give you a all India roaming free, when you are connected in your local network. Tata to Tata calling rates is also reasonable and local calls is also 60 pesa per minute. Sms cost is also 60 paisa. Internet pack costs is too much good. And net connectivity is also good you have give 60 kbps to 160 kbps speed on 2g network. DoCoMo launch 3 g service in all over Maharashtra bu not in Mumbai. When you leave Mumbai after you have got 3g network. Tata DoCoMo has solve voice break problem. Customer support service is also good. I m waiting when DoCoMo launch 4g. I m exited to use 4g on DoCoMo network.