I think it was kind of mimicking when Ronda called Michelle I think her name was and left that voice message. I think that's the episode your talking about.
One of the bus crash victim's friends, Rhonda had a voice message off her mate who died. It had her talking for a few 秒 then 你 heard an explosion and then 你 heard the bus crashing off down the cliff.
Veronica is being haunted 由 the people who were on the bus on 'I Am God'. The mobile ringing is just saying that the bus is ready to crash.
