In the automotive aftermarket world, there are three types of scan tools available for shops: OBD-II generic, OBD-II enhanced and factory scan tools.
Smartphones can be used to diagnose all the activities going on in a vehicle. This ranges from the brake pads to fuel consumption and economy, and even the entire engine. It is easy to diagnose an automobile system using a Smartphone.
Many shops, however, will purchase either an OBD-II generic or enhanced scan tool, because one tool can still complete the functionality a shop is looking for on a wider range of makes and models and at a lower price point than a factory scan tool.