I have a bsnl 3g sim card and so much upset by its network. when I watched ads on tv that it is providing free roaming across India and best network I bought the sim. and when I started using it I faced a lot of problem o doubt it offers best offers but there is network problem.
If I talk about Delhi the capital of India then there is no network on bsnl sim few of times it shows roaming of dolphin either there is no network and if I talk about greater Noida then there if own network of bsnl but if someone calls you then it will reply that subscriber.
Os out of coverage area and you called anyone then there is no clear voice so that you could understand what person wants to tell on the phone.