Purchased Aircel SIM just due to some net offer for second SIM slot in my cellphone as I was already using an Airtel number.One of the funniest issue I came across with this network is that in spite of being in the same city that is Delhi, the network shows roaming on the phone most of the times.
The customer service people are incompetent and rude and they talk as if they do a favor by receiving customers call and do not provide a single help. Networks are OK but internet speed is very pathetic as compared to Airtel or Vodafone.
Finally, came to conclusion that Airtel or Vodafone will always remain first preference and this network should never ever be considered for main usage.