Marks POV:
We finally find the phone, and the cop handover the phone to Tom and Tom immediately looked at it...
Tom: "I think it's not the usual phone, Mark..."
Mark: "What do you mean?"
Tom: "I guess it's a satellite phone...
He can only receive peculiar satellite calls who want to speak to him, but the other person also should use the same kind of phone..."
Mark: "Then, if we find which satellite they are using, we can trace everyone who is using those satellite, and it's easy to track the one who is behind all these..."
Tom: "Yes, but do you think they will use a particular satellite for all their illegal activities?"
Mark: "What do you mean?"
Tom: "They will hack some space in the satellite of all possible satellites, and they will change it frequently, so it's tough to identify who is behind this..."
Mark: "So, it's no use with this phone?"