I just saw a Frontline documentary about smuggling Yazidi women out of ISIS held territory in Iraq - and the guy on the outside was talking on his cell phone to people in the ISIS held areas.

I've also seen cell phone videos from other ISIS areas, not to mention parts of Afghanistan which seemed to be falling apart.

Is there some unwritten law that no one messes with the cell phone towers - but who does the repairs? How do you pay your cell phone bill in Raqqa?

Any ideas?