The man was a handsome dance instructor who had contacted these two girls online.
One girl wanted to find a place to end her life, while the other was deceived into thinking that they were going on a long-distance hiking trip together.
The man persuaded the girls to throw away their phones and keep secrets from their families and friends. All in the name of breaking free from social constraints and achieving true personal liberation. They were to find some excuse to leave and then meet up with him.
What happened next couldn't be found out from the phone. Obviously, after the three met up, they no longer communicated via phone.
Perhaps, the two girls really did what the man asked – they might not have brought their phones at all.