I also registered with Smile Car and bike helpline last August '08. I had breakdown of my scooter on two different times on the Greater Noida Expressway. First time I called them and the phone kept ringing after repeated calls. Frustrated, I gave up. Second time some months later I called them again and their "number doenot exist". I had to drag it for 8 kms of the expressway and get a mechanic.
Beware, these helplines are nothing but duping companies. They take your money and vanish in thin air.