What is cold calling? According to Wikipedia, cold calling is: 
the processing of approaching prospective clients, typically via telephone, who have not agreed to such an interaction. The word “cold” is used because the person receiving the call is not expecting the call or has not specifically asked to be contacted by the sales person. It is often very frustrating and difficult for those making cold calls because they are often rebuffed, hung-up on and rejected by those receiving the calls.
It would be interesting to know how effective cold calling is. For me, cold calling is always annoying. I believe many people have the same feeling too. If this is the case, why are those companies still spending money to make cold calling? I have no idea…. 
Recently, I had a problem with the number of “cold calling” to my fixed-line phone number. I receive phone calls offering products or asking donations almost everyday. That’s why, I never pick up any phone calls to my fixed-line number any more. Fortunately, I never published my mobile phone number. Otherwise, I may have gone crazy.
Actually it was my mistake to publish my number to the phone book. Why did I do that? Because my phone provider (Telus) charges $2/month if we decide not to publish our number (see the screenshot below). It’s ridiculous, isn’t it?
I have just asked my phone provider to remove my number from the phone book. Hope this will reduce the number of cold calling. Otherwise, I have to change my phone number….
I was very surprise too…. Honestly, I don’t have interest in probability and statistics, but recently I had to learn them to prepare