Before you go ahead and badmouth Dolphin, keep in mind that this is a product from govt company, so(a), they do not have incentive to cheat and increase revenue per user, and(b), they do not have incentive for customer satisfaction also. kind of black and white either ways.
Agreed, network signal strength is poor at times if you are outside metros/ roaming, network traffic at times(calls may not go through) and internet may not work at times. But, do you believe you won’t face these problems with the private operators!
I am using Dolphin 2G prepaid for past 2 years and am a quite satisfied customer. I also have Vodafone post-paid which I really regret. My nature of job involves frequent travelling so I am on roaming a lot. The roaming charges of Dolphin are the lowest among all. I even get connected to internet on roaming!
If you really want to avoid trouble with customer service(problem with all operators including dolphin, idea, Vodafone, etc), go for pre-paid connection. You can rest assured that you will not be ripped off through unexpected charges in bills at the end of the month.