Free misscall alert in Airtel
1]Go to settings.
2]Go to call setting.
3]Go to call divert then out of reach.
4]Then activate it to another no:
Mumbai: *62*+91560#
Rajastan: *62*+91569#Maharastra:
*62*+91675#TamilNadu:
*62*+919894035100#
Or Try Dialing these.