This trick is for activating free voicemail on vodaphone mobile network india.
To Send voicemail to a person for free, put * in front of the person's mobile number and dial, the person will receive your voicemail.
To send voicemail free on vodaphone
Dial *#104# and request, then you will see a number beginning with 44,replace the number with 0 and send free voicemail to anyone in VODAPHONE india.