I'm using airtel sim from 6months.this is the best sim ever I had used.the best network in 3G in our Durgapur circle.
The downloading speed almost all time same as 1mbps.most of the time they provide me various offers like full talk time .call rate cutting power.and internet offers at low rate.the night pack of airtel is awesome.In rs 8 you can use unlimited 2G internet.so the best network we can say
