At it's simplest, you can send a Vodacom Please Call me by dialing *140*vodacomnumber# to send a free SMS message to a Vodacom Subscriber who hopefully has some airtime to get in touch with you.
You can customize your Please Call Me settings by dialing *140#
A USSD menu will pop up with the following options:
Block/Unblock Call Me Messages
Send Recharge Me
Send Call Me
The option to change your name will let you change your own, custom 10 character name / message once a day and the Disable/Enable Advert option will stop you from receiving adverts in Vodacom Please Call Mes that are sent to you. You can also block Vodacom Please Call Me messages entirely by selecting option 1.