From the statute:
23123. (a) A person shall not drive a motor vehicle while using a wireless telephone unless that telephone is specifically designed and configured to allow hands-free listening and talking, and is used in that manner while driving.
"Using a wireless telephone" is the part that is open to interpretation. I never said anything about any other object (map, etc.). The person had the phone in their hand. The vehicle was running and on a roadway (i.e. "driving"). I disagree that using smartphone functionality doesn't fall under the "using a wireless telephone" part of the statute.