From all the WW2 movies I watched as a child, one of the first things enemies tried to do was take out the other sides comms. With IS, it would seem sensible for the US or UK (or Russia, of course) to use some drones to take out the mobile phone towers, thus making IS comms much more difficult. They would then have to rely on satellite phones and, with so much less traffic on these, it should be easier to monitor the necessary discussions.