sim card winner

i was having a haircut earlier when my mobile phone rang, i checked who was calling and it was a number not in my list of contacts.  i usually would not answer calls like that but i was thinking it could be one of my co-worker who was also on days off and whom i was about to meet up before dinner.  so i answered the call, it was a woman with a good tone of voice, though she was talking fast, i did understood her.  she tells me then that my mobile number was chosen as the winner of a sim card of another local network provider, added that it will be sent through courier and i need to dictate to her my full name and home address.  huh? wtf is she thinking?  i turned off my phone before she can say another word.  i think this is a scam.