How to send please call me on vodacom

How to send please call me on vodacom.  Are you out of airtime and you really need to call and speak to someone.
Please call me on Vodacom allows you to send an SMS asking that person to call you. The service is free of charge.

To send plese call me on vodacom. Dial *140*# e.g *140*0760123456#. You can send upto 10 please call me messages per day from vodacom network.