0 0 0*** Spoiler - click to reveal ***When you receive a strange phone call, you will have two options: write down the number they tell you either in your notebook (if you picked it up) or on your hand.If you write it down on your hand and later decide to call the number, you will discover that the last two digits got erased and you will have to guess them.If you guess them right (7 and 9), this achievement will pop up.