I bet a lot of people received a call from an 'unknown caller', which appeared at their mobile phone screen, and a female caller will say she called from a company. She will then say you had won thousands of ringgits, house, or even luxurious cars.
I for one received this kind of so called 'spam call' quite a few times before. The most noticeable is a call from a Chinese national company during first day and first minute of the university life!!! Imagine that when the lecturer was going to start the lecture and suddenly a female caller from "XXX公司" and said that she is promoting some kind of product which I don't care to listen. Then, I straightaway and ask her that where she get my number, which she refused to tell me. After that, I told her that I am busy man and have no time to entertain her. However, the operator was quite persistent. She keep explaining that I might win something luxurious if I bought one of the products. In no time, I just hang up the call and switch off my phone.
Another same type of call that I received is also occurred during lecture. This time they say I had won a scholarship worth hundreds of thousand in ringgit. This time they SMS me first before try to call me. By the time they try to contact me, I block their calls.
All this while I know about people are trying to scam through calls, but I never thought that I could be one of the target. For where and how they obtain the numbers, I have no idea. I won't be surprise at all if they simply key in the number and try their luck.
Remember, there are not free lunch in the world, we have to work hard for it.