Store it or Lose it
On Attractions where they offer you to put your belongings in a pocket on the ride, use it. The reason they provide it is due to space and that it will help to prevent your items from leaving the vehicle. DINOSAUR and KILIMANJARO SAFARI are true examples of this. You may think you have a hold on that IPhone, but after being bumped around quite a bit, you run a VERY high chance of dropping it.