Aircel was my first ever network operator. I used this network operator for 3 years. Now in Karnataka this operator no longer because government cancelled their licence in 2013. Their network was good. Their plans were too good and cheap compare to other network operators.
Their internet speed was good. They are the first ever network which provide 1 day internet pack @ rs 5. I am missing this network provider. But their customer support was not good. This network provider was really fast growing but unfortunately due to 2G scam government cancelled their licence in many state. And they loosed reputation.