Our Slide Fire series continues today with a look at how cell phones worked - and DIDN'T work in Oak Creek Canyon during the fire. Thousands of visitors drive through the scenic switchbacks every day. But once they descend below the canyon's rim, cell phones generally become useless. In an emergency situation, there's no 911 access for several miles. As KJZZ's Laurel Morales reports, that was a big problem when the Slide Fire broke out.