Although these phone interviews may be shorter and seem more informal than the in-person interview, which is considered to be the main event, do not make the mistake of treating them as a warm-up.
Your conduct during the job application and search process can have an impact on your reputation (positive or negative) and therefore it is important to apply the same level of care and consideration to your job search as you do to preparing your application package.
Your resume should be a collection of the highlights of your professional experience and these highlights need to be organized in a way that is easy for a reader who is unfamiliar with your experience to follow.
Your cover letter is the first impression in your application package and gives you the opportunity to say what it is about your experience that makes you the ideal candidate. Unfortunately, a poorly written cover letter can actually work against you and cause a hiring manager to dismiss your application before even getting to your resume.