I have been using bsnl sim for 3 weeks , I have found out the packs were cheap and it was really economical , But bsnl services really sucks .
The data connection speed is low than 2G , I dont know if everyone experienced this, but in kerala BSNL network is complete waste because its unreliable.
Most of the areas are said to be in out of coverage area , the only plus point I find in bsnl network is just its economical , rest the network is failure in kerala circle .
If u moved to kerala then its better u dont go for the bsnl network as its un reliable here .
Oh and the bsnl customer service is just a headache