BSNL is one of the biggest mobile networking in india.i bought a sim of bsnl and there is a lot of network problem in my are.i live in delhi and I facing a lot of problem with the network and the internet speed.i activated a 3g internet pack on my bsnl network and I found lots of problem.first of all there is a lot of fluctuation on the network and the speed of the internet is very slow.i got 3gb data from the pack which I activated on my mobile number and the speed was so slow that I was unable to consume my all data in a month the internet surfing was a very bad experiencethe internet was so slow that is coul be used only for the whatsapp and facebook.the heavy duty net cannot be used on the 3g pack of the bsnl sim.they cut the balance all the time from the main balance of the mobile.the experince with the bsnl is very bad and I do not suggest this.