Few days back I was sitting in office when i received a business card with a female title (name). I was busy in something really important at that time so ignored and deleted that business card. However later on I was told by a relative that whats it all about and I was amazed at the mentality of people exploiting such basic functionalities to transfer balance from pre-paid mobile accounts. Heres how it works
You receive a business card with a female name ( Shazia, Nazia or some name starting with letter A).
Majority of people get curious and after saving , call the received contact.
The received contact doesnt have a phone number in its number field rather the balance transfer code (i.e. *100*PhoneNumber*150#).
There you go, you have lost the balance.
Seems quite impressive as compared to its sms based counterpart.