It's 3:00 am and your phone rings, waking you up. When you answer, at first all you can hear is a noisy connection. Then, through the noise - faint but distinct - a child's voice saying "Mommy (or Daddy, if you are male)… Mommy... I want to come home...". Then the phone disconnects. Do you go back to sleep? Or get concerned that a child might be in danger?