Once I have got a call from reliance operator saying that we give you an offer of talktime and 1 paisa/sec.
I got irritated with the airtel too cost calling rates and put a port.
After 1 month of usage the offers were expired and I called the customer care regarding this they said I need to recharge my number with rate cutters.
Again I got irritated with this kind of service and poor signals at remote areas I transferred back to airtel.
Do not get cheated with limiyed time offers.