I have a problem. I don't answer numbers that I don't know. Common sense though, right? Why would I answer? Problem: All numbers are unknown to me. I have not a single other number saved in my contacts other than my mother and some very few friends. This is an issue because my mom and friends aren't the only people who I need to stay in contact with.
So why don't I simply program the other number?
I'm lazy. That's really it. I'm just too lazy to track down all my other "important people" and hound them for their number.