Beginnings

You are a 16 year old girl and you're walking home from school when you get a call from your mother. This is strange for two reasons: One, your mother died in a car crash a year and a half ago. Two, your phone is dead. And three, you changed your number when you moved to London. That means you have three questions. They are, who is calling you, why are they calling you, and how did they get your number?