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Using the telephone book is part of making cold calls to find work in your job search activities. You must find job possibilities that are not being advertised. Finding a job depends on your actions, abilities, and attitude. When making cold calls by phone, be pleasant. Remember you could be interrupting an important task. Keep a smile on your face. Ask if you could tale with them a few minutes. First write down a series of questions you will ask. My suggestion is to call the business earlier in the day and get the name of the person in charge of hiring. Call back later of the next day, and ask to speak to that person by name. This puts you one step ahead. Find companies located in the area you want to work. If the company has business all over the city, call the headquarters first. They most likely will give you the name and number of your area. Then when you call, use the name of the person you spoke with. "You might say, "I spoke to Ms. Brown, at your headquarters, and she told me to call you regarding a clerk position". Now I realize the internet is a tool for basically the same thing, but when using the internet you might find yourself doing something else before you realize it. Use the telephone book for job search also. Go get the job.
It's good to talk.