Very early morning calls. Since I never answer any numbers I don't already know I just let it ring or hang it up without even checking to see who is on the other line. Its never usually anything good.
Hmm make that 3 times in 4 mins. I don't answer unknown calls. I learnt my lesson the hard way. In the past it has lead to unauthorized charges on my phone from a number outside the NORTH AMERICAN calling area! YES I was asked to hold regarding a package at Customs....... after 4 mins I had no time to continuing holding! I disconnected the call. I called it back after my meeting and it was a hoax, number wouldn't register or ring, and my phone was already charged an UNPLAINABLE amount of money for holding for 4 mins!
NOT WORTH IT!