I was using airtel from last two years . one of my friend suggested me to switch to bsnl which is popularly known as bharat sanchaar nigam limited . but when I switched it I found that its has the worst network everywhere either in the city or in village.
Even if you are standingh below a bsnl tower you may face network problem I dont know why?/ actually its fullform should be bhaai saahab nahi lagega . at last I just want to suggest not to use or buy any type of sim cards of bsnl