Now after collecting this number,you call them asks them what you want to know. As they are a huge database of information for the support like you people who have all sorts of expertise but may be unable to get their desired job for this or that reason, so do not worry go ahead.They will asked you some formal question,or may be some question depending on your profile status to whome you have to be perfect enough and after that you can see yourself in a commanding position of getting a job,then they will process your application with their clients and soon you will be in employee lines.