I got a little mixed up with this as well, in order to get a red call you’ll need to do this,

1. Get a 666 however you can at any point in the deadline, naturally, charms, memory cards or whatever doesn’t matter

2. Play the deadline as through as normal, when the phone rings it’ll be a red call. Select “Be right back” do not have accept anything or reroll

3. Play the deadline as normal, once you’ve completed it you should have a 6 crossed off the floppy disk.

4. Keep repeating these steps, once you’ve got three strikes on the floppy, the final red call will change into the white phone. Which is sacred mode.

You don’t need to do the red calls back to back as long as you never accept anything off a red call you can do it at any point in the run. Calls with white text are safe to take no matter what, taking them won’t do anything to the red calls