062.
The first sign is ominous.
Well, not really.
The first sign is passed off as a joke by Jonghyun, who thinks that no one is closer to Kyuhyun-hyung than himself. He is, of course, very misguided. Still, he has to reassure himself that they're only closer physically, not emotionally, because that's just delusional, isn't it?
The second sign should have made the hair on their necks rise, made them squeak with fear and hide under the beds. Instead, Taemin laughs it off and tosses the phone carelessly and then winced when it cracked upon meeting the tiles.
Finally, they decide to listen when the phone rings at three am, when the last one had finally crashed.