the full SCC decision is here:
http://scc-csc.lexum.com/scc-csc/scc-csc/en/item/14502/index.do
It was a split 4/3 decision. The reasoning of the majority is:
So as many have said earlier in this thread, you likely shouldn't email from your phone &shouldn't text regarding hobbying. You may want to have a separate poon phone and not have your poon phone on your person when you leave your car. Have it hidden from a minor search of the car and carry your regular phone so LE isn't going to specifically look for one in your car.
Basically be aware that LE can look through your phone without a warrant when on your person if they have arrested you and mitigate that risk. As pooning isn't drug running or a violent crime where there is a reasonable suspicion that evidence might be found, there is likely little reason for LE to undertake a comprehensive search of your car if there are no blatant red flags (like where is this guy's cell phone???).
Or you could just decide that if they have arrested you, your goose is cooked so why worry about them finding more evidence.