I am using bsnl evdo since 3 years and I am fully satisfied with this service, its amazing I never had any major complain with it and if whenever I had any issue it is solved immediately by bsnl executives, it is the best available service in low cost as compared to other service providers.
Bsnl is the trusted brant it never charges you unlawfully and it provide my evdo usage bill with full details which have full clarification the when and where my data plan is used