I am existing customer of Tata Docomo CDMA Rajasthan circle since 2006. I am glad to tell you that network quality is awesome.
In my office my seat at basement so everyone having trouble due to network problem and go outside to receive call, But my phone is always showing full network and easily I am attend the call without any problem. I am recharging 149 T2T unlimited plan due to my family. Voice clarity is perfect and disturbance free. So I am very happy with Tata CDMA network except I am still searching CDMA android phone. And one problem also I am facing that data plan are not available in Rajasthan circle. But overall they provide very reliable and cheap service.