BSNL is an India’s government company. It is a cheapest network never seen befor. BSNL the largest network which powered or included 2g, 3g, 4g, also broadband, and landline.
About network coverage is good but somewhere may disappoint. Many emploies are appointed in Customer service or customer care to help customer, good response from the service. Charge free roaming may be.
All over BSNL is nice network.