jeffmorris:
I thought that setting up Bluetooth communication is easier than IR or RF communication.
It probably will be easier. However, my reply was about the range you could expect. Most BT modules in phones and tablets are lowe power and will have a much small reliable range than IR or AM/FM based control system. I'm not implying it can't be done. I'm just letting you know that you shouldn't expect to be able to control the car from the more than a few feet away.